Codechange: automatic adding of _t to (u)int types, and WChar to char32_t

for i in `find src -type f|grep -v 3rdparty/fmt|grep -v 3rdparty/catch2|grep -v 3rdparty/opengl|grep -v stdafx.h`; do sed 's/uint16& /uint16 \&/g;s/int8\([ >*),;[]\)/int8_t\1/g;s/int16\([ >*),;[]\)/int16_t\1/g;s/int32\([ >*),;[]\)/int32_t\1/g;s/int64\([ >*),;[]\)/int64_t\1/g;s/ uint32(/ uint32_t(/g;s/_uint8_t/_uint8/;s/Uint8_t/Uint8/;s/ft_int64_t/ft_int64/g;s/uint64$/uint64_t/;s/WChar/char32_t/g;s/char32_t char32_t/char32_t WChar/' -i $i; done

Codechange: Add missing `this->` in override manager.

Variable scope is also tweaked in a couple of cases reducing line count.

Codechange: Use vector for NewGRF spec overrides.

This replaces C-style memory management.

(svn r11248) -Fix[FS#1314]: The logic behind industry slot allocation was implying that the only condition an override could be placed in a slot is that there were no previous override.
That is not exact: the slot must not have been occupied by an industry coming from a grf.
So now, tourist center is available if more then one grf is used

(svn r11058) -Fix[FS#1216]: GetTerrainType was a bit too relax with snow line.
After double checking with ttdpatch, behaviour is now more alike (Eddi)