Added input and menu icons to align with the reference monochrome theme and address Issue #262 for the Automatic and Systematic themes. Refined some existing menu icons for consistency in design. Optimized PNGs with ImageOptim.
Added the new menu icons for Automatic and Systematic per retroarch-assets #220 and RetroArch #7048.
Added icons for the Thomson T08 and T08D to Automatic and Systematic to fulfill request #218.
Added the Systematic SVG files to the /src/xmb/ directory. Changed the font to Titilium Web Regular. Refreshed the files in the /xmb/systematic directory. Added about 50 new icons to the set.
Renamed Sega and NEC systems with model numbers found at segaretro.org and necretro.org. Added PC Engine LT, Super CD-ROM2, Famicom Twin, Panasonic Q, New 2DS XL colors, iQue, 3DO Alive II and Mega CD/Sega CD Model 1 with open disc tray. Changed ChaiLove to reflect new design. Fixed New 3DS (#198) pointer and battery icons based on feedback in the Libretro Forum and GitHub Issue pages.