sqf: prevent changing reserved variables

[BrettMayson]

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 40 lines in your changes missing coverage. Please review.

Project coverage is 68.3%. Comparing base (faaccb2) to head (cee099c).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/analyze/lints/s23_reassign_reserved_variable.rs	79.7%	40 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
libs/sqf/src/analyze/lints/s18_in_vehicle_check.rs	73.3% <100.0%> (ø)
libs/sqf/src/analyze/lints/s22_this_call.rs	74.1% <ø> (ø)
...rc/analyze/lints/s23_reassign_reserved_variable.rs	79.7% <79.7%> (ø)

[PabstMirror]

~20 hits in CBA (although mostly in test funcs)
macro DEFAULT_PARAM triggers it

DEFAULT_PARAM(2,_resolution,10);

#define DEFAULT_PARAM(INDEX,NAME,DEF_VALUE) \
    private [#NAME,"_this"]; \
    ISNILS(_this,[]); \
    NAME = _this param [INDEX, DEF_VALUE]; \
    TRACE_3("DEFAULT_PARAM",INDEX,NAME,DEF_VALUE)

#define ISNILS(VARIABLE,DEFAULT_VALUE) if (isNil #VARIABLE) then { VARIABLE = DEFAULT_VALUE }

maybe warning instead of error?

[PabstMirror]

tag PR #802
need to protect _this

[BrettMayson]

Should also cover params