Added overload for DrawString taking a Point to avoid creating a rect for callers which only use position. This also documents the way DrawString operates when passed a clipping rectangle with a dimension of 0.
As part of this overload removed the logic for 0 width regions from DrawString. This does change the behaviour of the Rectangle version if called with a rect with width 0, all callers using that behaviour have been updated in this commit.
Using Rectangle/Size allowed simplifying the logic for certain calls where they could use DrawText alignment flags, previously this was manually aligning by calculating dimensions and offsetting the position. This also fixes#2169
Also includes a few instances where a temporary buffer was used to set the text to be drawn with unbounded sprintf calls, replaced those with snprintf as is recommended in modern C applications. Moving to C++ strings would be good in a future refactor.
Fixes a giant non-exhaustive switch warning in `UseInvItem`:
```
../Source/inv.cpp: In function ‘bool devilution::UseInvItem(int, int)’:
../Source/inv.cpp:2131:9: warning: enumeration value ‘IDI_GOLD’ not handled in switch [-Wswitch]
2131 | switch (item->IDidx) {
| ^
../Source/inv.cpp:2131:9: warning: enumeration value ‘IDI_WARRIOR’ not handled in switch [-Wswitch]
../Source/inv.cpp:2131:9: warning: enumeration value ‘IDI_WARRSHLD’ not handled in switch [-Wswitch]
../Source/inv.cpp:2131:9: warning: enumeration value ‘IDI_WARRCLUB’ not handled in switch [-Wswitch]
...
```
This mostly change player to be by reference instead of by index.
But additionally it does stript checks for gold in the belt, move some
value types to the initialization and short circute a few functiongs.
