Refactor heap parsing code

[XVilka]

Currently some of the heap parsing depends on how rizin is compiled. While it will work for the local native debugging it will inevitably fail in cases of the remote debugging or coredump/minidump files opening. Thus, some of the heap parsing code should be made not conditionally compiled but able to detect the target endianess, bitness, libc version, other parameters in the runtime, and call the corresponding routines accordingly. It is especially the case for jemalloc heap parsing. See these files:

• librz/core/linux_heap_glibc.c
• librz/core/linux_heap_jemalloc.c
• librz/core/windows_heap.c
• subprojects/rzheap/*.

Note, a part of this task would be adding jemalloc-5.x heap parsing which has a different structure (currently Rizin can parse only jemalloc-4.x heap structure).

[XVilka]

I also suggest to create a subdirectory librz/core/heap/* where we should move all those files, so it will be easier to navigate.

[ret2libc]

What's the status of this? Also, the issue references many "problems" and features, so we should be clear what is missing and what not. @XVilka @PulakIIIT

[kj5377707]

HI, I want to try this microtask for GSOC