Release Notes for version 0.15.4

• Add updated support for Intel C/C++ compiler 2020
• Add first pass for AOCC compiler 2.x ( AMD C\C++ compiler)
• clang tool was updated to find clang under RHEL SCL locations
• -fdiagnostics-color=always is added by default configuration for gcc/g++ 7 or newer
• MergeScriptVariables logic has been updated to accept a remove list of regular expression to allow removing items that should not be added to the environment. By default LS_COLORS, BASHOPTS, SHELLOPTS, PPID are removed.
• Fix to scanner for symlinks to add soname based file in the depends change to avoid certain cases with build failures.
• Fix to subst mapper logic to address a case when the certain list values would get cached to before the all item are known.