Add a few stack overflow protection

Add various missing functions, and also fix a crash (thegrb93#1307)

* add Entity:getBoundingRadius

* add PhysObj:getSurfaceArea, PhysObj:isMoveable, PhysObj:getVolume, PhysObj:getStress

* fix bodygroup crash

* add Entity:getBodygroupCount

* oops! -(2^31-1) still crashes... just make the minimum bodygroup id 0 then

* add Entity:isDormant
not exposed in e2 either but very useful function

* add Entity:getNearestPoint

Refactor and cleanup preprocessor. Also add doc info for url include

Add vmatrix.getRotatedAroundAxis

Update physobj.lua (thegrb93#1131)

* Update physobj.lua

Add phys_obj:getVolume()

* made return number optional in docs

applied information
thegrb93#1131 (comment)

Fixed big endian encoding of int32 and int16. (thegrb93#1102)

Before the fix
```lua
local stream = bit.stringstream("", 1, "big")
stream:writeInt32(90)
print(stream:size()) -- 3
```
only writes 3 bytes instead of 4.
```lua
local stream = bit.stringstream("", 1, "big")
stream:writeInt16(90)
print(stream:size())
```
fails with
```
addons/starfallex/lua/starfall/libs_sh/bit.lua:324: attempt to get length of local 'v' (a number value)
stack traceback:
	addons/starfallex/lua/starfall/libs_sh/bit.lua:324: in function 'size'
	SF:tests/stringstream_bigendian_test.txt:7: in main chunk
```
because `ss_methods:write(data)` expects a single string.

Make convar default allowed. Fixes: thegrb93#1046

localize class

Fix some networking bugs from newly joined players. Fixes: thegrb93#1005