add ccache option and transparent color instead of bool

[zxkmm]

ccache

• previously Speedup compilation using ccache package #1832 added ccache
• we on discord found sometimes ccache creates issues, i removed it revert adding ccache tool #2153
• but it sometimes useful, so this time add back and optional.
• it's default disabled, unless you use such command:
  cmake -DUSE_CCACHE=ON ..then
  make or make -j or make -j10 etc
• the default behavior cmake .. then make isn't changed (aka don't use ccache), so it’s safe for pipeline

transparency color for bmp

/* draw transparent, pass transparent color as arg, usage inline anonymous obj

• portapack::display.drawBMP({100, 100}, foo_bmp, (const uint8_t[]){41, 24, 22}); // dec, out of {255, 255, 255}
• portapack::display.drawBMP({100, 100}, foo_bmp, (const uint8_t[]){0x29, 0x18, 0x16}); //hex out of {0xFF, 0xFF, 0xFF}
• draw transparent, pass transparent color as arg, usage pass uint8_t[] obj
• const uint8_t c[] = {41, 24, 22}; or const uint8_t c[3] = {0x29, 0x18, 0x16};
• portapack::display.drawBMP({100, 100}, foo_bmp, c);
• don't draw transparent, pass nullptr as arg, usage
• portapack::display.drawBMP({100, 100}, foo_bmp, nullptr);
• ifyour image use RLE as transparency, pass any valid color as arg, it doesn't matter (like the modal bmp. TODO: write RLE transparency generator)
• */

[gullradriel]

Okay, look good to me.
We have to watch over next nightlies ;-)