Rename top-level make tasks: verb first
Disable GL_DEPTH_TEST
Use `pthread_mutex_trylock` instead of `pthread_mutex_lock`

Before this change, the app would use >60% of CPU when not visible.
WS
Remove pointless mutex lock/unlock step
Use lighter horizontal grid lines: base2 instead of base1.
We are clang-based now.
Bulk-reformat all .{c,h} files

Using: `astyle --style=google *.{c,h}`

[0]: http://astyle.sourceforge.net/astyle.html#_style=google
[wip] Up/Dn arrows cause display rendering to zoom, kinda
Remove `ring_buffer_pop`
return -1 from ring_buffer_get_n if n is larger than buffer size
Remove blocks from makefile gcc command
Use GL Draw List for drawing the static grid lines
merge conflicts
Add scroll-zooming, make event vars more consistent
Lessen zoom-to-scrolling factor