refactor: Changed some char* args to const char* to avoid warnings
fix: avoid infinite loop in problematic environments
Switched to calling Acos() for safety
Made direct visibility (-dv) flag irrelevant and fixed BSDF material sampling
Minor bug fixes
Made ray direction storage more efficient (1/4 the original memory)
Removed some redundant globals
Added mksource to SCons build, fixed some compile warnings.
Changed to 98th percentile for default threshold
Created mksource program
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