remove old entities.def files
targeted search&replace on processed and unprocessed entities.def in order to...

* easier import into and export out of a MediaWiki
* remove duplicate keys that are discouraged by q3map2
* get the unprocessed closer to the target style
remove duplicate spawning of "wait" for '0' default values
clean up the first parts of gentity_s and associated functions, especially:

* give variables reasonable names, which should also avoid re-abuse, as soon as variable usage is cleaned up
* rename the concept "mover teams" to "mover groups" to avoid nameclashes with later introduced player teams as entity trigger filters
remove duplicate spawning for the remaining 'wait' and 'waitVariance's (including the non-0 defaults)
fix wait-time calculation in func_plat

previously it was overwritten by a fixed second (1000)
instead of multiplicating it with the wait-field-value