add precompiled mac version of curl (including sftp) and dbxcli, both code signed

Author: ThomasMaul

Documentation/Readme_GDrive.MD

@@ -53,7 +53,7 @@ For Windows, just copy in resource folder for easy deployment.
 For Mac: sign it, and then sign/notarize the embedding 4D application.
 To sign enter by example:
 ```
-codesign –force --options runtime --timestamp –sign Developer ID Application: 4D Deutschland GmbH (4789QA2D2W)" /Users/thomas/Desktop/gdrive
+codesign –-force --options runtime --timestamp –-sign "Developer ID Application: 4D Deutschland GmbH" /Users/thomas/Desktop/gdrive
 ```
 
 If Gdrive changes the API, just download the latest release from the github repository.

Documentation/Readme_curl.MD

@@ -35,12 +35,20 @@ By installing "your" own version SFTP will be supported additionally, and this a
 
 Precompiled versions for Windows can be loaded here:
 [curl.se](https://curl.se/download.html)
+You can deploy them with your application by adding curl.exe to your Resource folder or similar.
 
-To use SFTP on Mac you need to install [Homebrew](https://brew.sh) and run:
+To use SFTP on Mac:
+If you need it just for you, internally:
+Recommended way is to install [Homebrew](https://brew.sh) and run:
 ```
 homebrew install curl
 ```
 
+To get a deployable version of curl you can compile it yourself or use a precompiled version (compiled by the author in March 2022), see folder "Optional:curl_Mac_precompiled". This version is already signed to ease notarization.
+
+To compile yourself (or use a newer version) follow the steps in optional:curl_Mac_precompiled:owToCompileYourself.txt
+
+
 Copy class methods:
  - FileTansfer_curl.4DM
  - SytemWorkerProperties.4dm  

Documentation/Readme_dropbox.MD

@@ -45,11 +45,10 @@ You can compile it yourself (see instruction in link above) or download a precom
 
 For Windows the downloaded version could be placed in Resources folder and so easily deployed. 
 
-For Mac, it needs to be signed by you. To sign enter by example:
-```
-codesign –force --options runtime --timestamp –sign "Developer ID Application: 4D Deutschland GmbH" /Users/thomas/Desktop/dbxcli
-```
-But the latest version as available in February 2022 was linked with a too old MacOS Version (<10.9) which does not allow to notarise the final application, forbidding to set the file inside the 4D application. This forces you to download on customer side and install it locally, to avoid the need to notarise. I tried to compile following the instructions myself, while the resulted executeable could upload/download, it could get get directory information for the root folder, so I'm not sure if recompilation is a solution for Mac.
+For Mac, you can either use my (new compiled and signed, based on 3.0.0) or compile and sign yourself, to allow shipping it as notarized merged application inside the Resource folder. 
+The version published on GitHub (March 2022) is linked with macOS 10.9 and so too old to be notarized.
+The precompiled version is in /optional/dbxcli_Mac_precompiled.
+There is also a "HowToCompileYourself.txt" file, giving hints how to compile and sign yourself.
 
 
 Copy class methods:  

optional/curl_Mac_precompiled/HowToCompileYourself.txt

@@ -0,0 +1,37 @@
+Download:
+https://github.com/Frugghi/iSSH2
+
+this will handle compilation of OpenSSL and libSSH fully automatically!
+
+cd to folder and then enter:
+./iSSH2.sh --archs="x86_64" --platform=macosx --min-version=11.5
+./iSSH2.sh --archs=x86_64 --platform=macosx --min-version=11.5
+
+
+Next step:
+Download:
+https://github.com/curl/curl
+
+cd to folder and enter:
+
+export ARCH=x86_64
+export SDK=macosx
+export DEPLOYMENT_TARGET=12
+
+export CFLAGS="-arch $ARCH -isysroot $(xcrun -sdk $SDK --show-sdk-path) -m$SDK-version-min=$DEPLOYMENT_TARGET"
+
+Then (replace my path with your path where you copied iSSH2):
+
+./configure --host=x86_64-apple-darwin --prefix $(pwd)/artifacts -with-libssh2=/Users/thomasmaul/Documents/Development/iSSH2/libssh2_macosx  --disable-shared --with-openssl=/Users/thomasmaul/Documents/Development/openssl-1.1.1m
+
+Followed by:
+
+make -j8
+make install
+
+Now you have in the curl folder a subfolder named artefacts/bin and there you find "curl", which is the just build version.
+Last step: 
+Copy it into your destination folder, such as resources and sign it. (Modify the path below fitting to your path), also use your certificate name:
+
+codesign --sign "Developer ID Application: 4D Deutschland GmbH" /Users/thomas/Documents/4D/Komponenten/FileTransfer_Curl/optional/curl_Mac_precompiled/curl 
+

optional/curl_Mac_precompiled/curl

@@ -0,0 +1,21 @@
+install go (https://go.dev/doc/install)
+
+Download source from releases, such as
+dbxcli-3.0.0.zip
+unzip
+copy source in ~/go/src/github.com/dropbox/dbxcli
+cd ~/go/src/github.com/dropbox/dbxcli
+
+go build
+
+you should have now in this folder a file named dbxli. Test if it works:
+
+thomas ~/go/src/github.com/dropbox/dbxcli  $ ./dbxcli version  
+dbxcli version: 0.1.0
+SDK version: 5.4.0
+Spec version: 097e9ba
+
+Last step: 
+Copy it into your destination folder, such as resources and sign it. (Modify the path below fitting to your path), also use your certificate name:
+
+codesign --force --options runtime --sign "Developer ID Application: 4D Deutschland GmbH" /Users/thomas/Documents/4D/Komponenten/FileTransfer_Curl/optional/dbxcli_Mac_precompiled/dbxcli