Object search

[yanqi27]

I started the branch trying to add a function for object search or profiling. I tried to show the statistics of objects and maybe their hierarchical relationship. I was distracted to refactor some old code. To make incremental enhancement, I will merge some changes first and attempt another PR for complete object search. This one contains mainly the following:

• List all data types by given size range. (gdb has the similar command of info types <regexp>)
• Simplify the memory leak data types.
• Update the help messages.
• Remove prebuilt gdb binaries to lighten up the repo. (The new build script makes it much easier to build locally)
• Optimize the file structure for gdb-12.1 and gdb-9.2 while deprioritizing gdb-8.1 and gdb-7.11.1.

[Celthi]

The dependency chain I can see is

CoreAnalyzer -> CoreAnalyzerHeapInterface --> pt_malloc 2.31    
                                         \                 \
                                           pt_malloc 2.27   --> pt_malloc common functions.

If it is compile-time polymorphism, we use templates, if it is runtime polymorphism, we use virtual functions.