cmd3.c fix compiler warnings

Cygwin requires int parameters for most character functions.
Fix compiler warning in melee2.c
Eliminate compiler warning in monster1.c

Suspicious semicolon.  Reverses if statement to eliminate.
Eliminate compiler warnings in obj-ui.c

Cygwin requires int for character test functions.
Eliminate compiler warning in obj-util.c

Fixes missing break statement warning.
Eliminate compiler warning in object2.c.

Fixes missing break statement warning.
Eliminate compiler warning in store.c

Fixes missing break statement warning.
Eliminate compiler warning in target.c.

Fixes missing break statement warning.
Eliminate compiler warnings in ui-menu.c.

Fixes missing break statement warnings.