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.
Make stacksize as well as program name and priority configurable. The defaults are the same as the previous hardcoded values.
The default stacksize of 2048 bytes is more than enough for most target applications. However, when running on the simulator, much large stack sizes are needed.
