This commit changes only ones with the default 2048 and
leaves the others.
E.g. this leaves SYSTEM_RAMTEST_STACKSIZE, whose default is 1024.
I guess those need to be inspected one-by-one.
Squashed commit of the following:
apps/examples/pwlines: The example is complete and verified.
apps/examples/pwlines: A little more progress between distractions.
apps/examples/pwlines: Beginning of another per-window framebuffer test/examples.