Added 100 n) Rename modelsim_compile_ip_files into more precise name eg....

Added 100 n) Rename modelsim_compile_ip_files into more precise name eg. modelsim_execute or modelsim_pre_execute.

tools/hdltool_readme.txt

@@ -693,6 +693,9 @@ m) (FIXED) Issue exit error when a library name occurs double
    and cause misalignenment errors in the libraries lists which are difficult for a user to diagnose. The
    _init__ in hdl_config.py could check this.
    
+n) Rename modelsim_compile_ip_files into more precise name eg. modelsim_execute or modelsim_pre_execute
+
+
 
 101) More ideas