Fix Solarized Light and Dark color schemes

Summary:
Solarized Light contrast was low. Upon investigation it was determined much of the color scheme did not follow Solarized base 16 colors or rules. Color scheme for both Dark and Light variants were adjusted to match the latest Solarized color scheme release palette and color interaction rules. Color schemes were also matched closely to the Vim color scheme created by the original Solarized author.

This is my first "frameworks" patch, so please let me know if I missed anything.

This has also been added to KSyntaxHighlighting in D15340.

BUG: 382075

Solarized Light Before:

Solarized Light After:

Solarized Dark Before:

Solarized Dark After:

Test Plan: Open Kate with new rc files and inspect the Color settings. Open a CPP file to review syntax highlighting.

Reviewers: Kate, KTextEditor, Framework: Syntax Highlighting, dhaumann

Reviewed By: Kate, KTextEditor, Framework: Syntax Highlighting, dhaumann

Subscribers: dhaumann, kwrite-devel, kde-frameworks-devel

Tags: Kate, Frameworks, KTextEditor

Differential Revision: https://phabricator.kde.org/D15337