Enable GUI scripts

[IgnaciodelaTorreArias]

Resolves: #2310

• Added tests for changed code.
• Updated documentation for changed code.

FEATURE: ability to define gui scripts

The implementation is based on the official specification by @abn #2310

Created a script to be used with Windows gui_scripts, when using poetry install.

1. The script starts a new window with an empty title "", in this new cmd pythonw is executed with the python script that is created for unix systems as argument (just as in console scripts), any other arguments are forwarded (just as in console scripts), The start command
2. Since pythonw doesn't starts/need a command window only the GUI window is opened, if the python script is defined correctly on the scripts section.
3. After starting pythonw the WINDOWS_GUI_CMD_TEMPLATE finishes, this means that if {script-name}.cmd was executed by clicking on it this will close the command window that was opened.

Questions:
To be able to run pythonw i used string functions [split, replace, join] modifying the python path provided, i don't know if this is correct?
Using pythonw means this only works with the CPython implementation, is this OK?

Updated documentation corresponding to the scripts section.

Based on PyPA entry-points specification defined console scripts and gui scripts.
Also added a warning deprecation for

[tool.poetry.scripts]
my_package_cli = 'my_package.console:run'

this is because of a TODO

Example

[tool.poetry.scripts]
my_pachkage_gui = {reference='my_package.gui:run', type='gui'}

testing

• Tested manually with a repository a created with this purpose DearPyGUI-example-poetry
  For this testing i also needed to modify poetry-core, i will make a pull request after this one is merged.
   

[dimbleby]

haven't looked at the code but, any implementation for this should have corresponding changes in poetry-core for building wheels

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