Make Prediction lerping less pick + debug

- Lerping uses int rather than fixed/float comparisons
- Added debug information
Fixed broken ACS on Big Endian platforms

This fixes maps transition in Strife
http://forum.zdoom.org/viewtopic.php?f=2&t=36754
Merge branch 'LerpAdjustments' of https://github.com/Edward850/zdoom
Merge branch 'fix_acs_big_endian' of https://github.com/alexey-lysiuk/gzdoom
- Fixed: BUDDHA flag on a player wasn't considered.
- Added FOILBUDDHA check for A_BFGSpray.
- Fixed: Rail attacks didn't properly respect FOILINVUL.

- Added: FOILBUDDHA support for rail attacks.