fdo#75280 Started cleaning up of sal_uIntPtr usage.

Converted wrong usage of sal_uIntPtr to appropriate other types in basic
module.

The bug is not fully fixed with this since many other occurences of sal_uIntPtr remain.

Update due to code review comments:
Fixed forgetting to change some declarations in iosys.cxx.
Cleaned up the one remaining sal_uIntPtr in iosys.cxx
Fixed adding a sal_uInt64 to a Date (uses long now instead) in methods.cxx
Fixed the VarDecFromUI4 call in sbxdec.cxx from sal_uLong to ULONG .

Conflicts:
	basic/source/runtime/iosys.cxx

Change-Id: Ia6460be04967deb68b92eb62d945da8814fae605