Script to automatically pull LVGL updates

[Richard-Stump]

Overview

Although updating liblvgl is less cumbersome now that it is removed from the kernel, we still need to do the following to update liblvgl:

• Copy all the header files from LVLG's repo to include/liblvgl
• Copy all the source files from LVLG's repo to src/liblvgl
• Update all the includes in the LVGL files to match the PROS project structure
• Update include/liblvgl/fonts/lv_font.h to include our custom fonts that llemu depends on

My Proposal

Fixing the font issue:

1. Store the fonts that llemu depends on in a vector graphics file
2. On build, the makefile creates the lvgl font.c files
3. The fonts are declared in a new pros_line.h file so we don't have to add then to lv_font.h

Automated update script:

The script should not run automatically when LVGL updates, since we want to force someone to make sure everything works and builds properly

These are the things I think the script needs to do:

1. Check the latest release tag on LVGL's repo. If we are up to date, do nothing
2. Otherwise, clone the repo as a submodule
3. Copy all the headers to include/libvgl
4. Copy all the c files to src/liblvgl
5. Run through all the copied files and update the includes to be absolute and follow the PROS project structure.