Remove dependency on colorclass

Closes #231

The colorclass module is not compatible with Python 3.10, and is
currently [archived on github](https://github.com/Robpol86/colorclass)
with issues open about future compatibility issues and no real
suggestion of movement.

This change replaces `colorclass` with the few color codes that were
actually used so far, which removes the dependency entirely and should
allow the CLI to work on python 3.10.

This appears to work where I've tested it, and from what I read it aught
to work the same on Windows too, but I'd like someone to give it a spin
first to be sure.

Author: Dorthu

README.rst

@@ -389,8 +389,8 @@ added to Linode's OpenAPI spec:
 +-----------------------------+-------------+-------------------------------------------------------------------------------------------+
 |x-linode-cli-action          | method      | The action name for operations under this path. If not present, operationId is used.      |
 +-----------------------------+-------------+-------------------------------------------------------------------------------------------+
-|x-linode-cli-color           | property    | If present, defines key-value pairs of property value: color.  Colors must be understood  |
-|                             |             | by colorclass.Color.  Must include a default.                                             |
+|x-linode-cli-color           | property    | If present, defines key-value pairs of property value: color.  Colors must be one of      |
+|                             |             | "red", "green", "yellow", "white", and "black".  Must include a default.                  |
 +-----------------------------+-------------+-------------------------------------------------------------------------------------------+
 |x-linode-cli-command         | path        | The command name for operations under this path. If not present, "default" is used.       |
 +-----------------------------+-------------+-------------------------------------------------------------------------------------------+

linodecli/response.py

@@ -4,7 +4,23 @@
 """
 from __future__ import print_function
 
-from colorclass import Color
+
+CLEAR_COLOR = "\x1b[0m"
+COLOR_CODE_MAP = {
+    "red": "\x1b[31m",
+    "green": "\x1b[32m",
+    "yellow": "\x1b[33m",
+    "black": "\x1b[30m",
+    "white": "\x1b[40m",
+}
+
+
+def colorize_string(string, color):
+    col = COLOR_CODE_MAP.get(color, CLEAR_COLOR)
+
+    return "{}{}{}".format(
+        col, string, CLEAR_COLOR,
+    )
 
 
 class ModelAttr:
@@ -51,7 +67,7 @@ def render_value(self, model, colorize=True):
             # apply colors
             value = str(value) # just in case
             color = self.color_map.get(value) or self.color_map['default_']
-            value = str(Color('{'+color+'}'+value+'{/'+color+'}'))
+            value = colorize_string(value, color)
 
         if value is None:
             # don't print the word "None"

requirements.txt

@@ -1,5 +1,4 @@
 terminaltables
-colorclass
 requests
 PyYAML
 enum34; python_version < '3.4'

setup.py

@@ -49,7 +49,6 @@ def get_version():
     license="BSD 3-Clause License",
     install_requires=[
         "terminaltables",
-        "colorclass",
         "requests",
         "PyYAML",
         "future; python_version <= '3.0.0'"