partial merge of the webgl branch This commit contains the new pas2c conversion tool, the pascal to c build structure and the opengl2 rendering backend. Patch reviewed by unC0Rr.

Fix checker logon process

changing build files without testing the change is fun, isn't it? especially for trivial things that would take less than 10 seconds to test :p

Make poison damage possibly variable (might as well since effects is a count). Scripts might find it handy.

Add check for gear kind of hedgehog on invulnerability effect. This probably fixes bug #766, is similar to change in previous r2a1483d91977 and was introduced by r7d925e82e572

well. let's fix this at least - only apply to gears that are actually hedgehogs, not just ones associated with a hedgehog (which can be pretty much any gear since damage tracking was added)

Convert some ansistrings to pchars

drop redundancies for lua and physfs

fix linking physfs after a run of cmake

happy 10000th commit also fix the travis build by adding a system physfs library