Add a proper python-bytecode icon, use consistent color in python icons

Summary:
BUG: 381051

FIXED-IN: 5.54

Add a separate, more recognizable icon for application-x-python-bytecode. Use a consistent, orange color for the 32px and 64px designs of application-x-python-bytecode and text-x-python.

The font used at all sizes except 64px is made of custom shapes to be as pixel-perfect as possible.

Test Plan:
The new application-x-python-bytecode icons:

Consistent style for 32px and 64px application-x-python-bytecode and text-x-python:

Reviewers: VDG, ngraham

Reviewed By: VDG, ngraham

Subscribers: ngraham, kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D17692