Merge branch 'mi-hardcode-again' into 'master'

MI hardcode again

Stuff hardcoded in this branch:
* Everything from SOC_TREE in patch.dta - the GFZ trees use thing types 806-808 and the other trees 810-816
* Everything from SOC_TOKE in patch.dta (but done better)
* Wall spikes, from Nev3r's DSZ/ACZ work, edited to actually hurt you on touch - these use thing type 522

MonsterIestyn/mi-hardcode-again on the FTP includes a test exe (srb2win-mihardcodeagain.exe) and a modified patch.dta (where SOC_TREE and SOC_TOKE are removed and missing wall spike sprites added). A test map for tokens in mario blocks is also included (marioblocktoken.wad).

See merge request !106