Create 64-bit address space version of RetDec IDA plugin

[PeterMatula]

Right now, we have only one plugin version for 32-bit address space (which is itself a 64-bit library, see explanation). It should be possible to also create a 64-bit address space version, which would for now decompile only 32-bit binaries (until we add support for some 64-bit architectures).

[Maroc-OS]

I think i have a working version of it. just need to be sure it's working great. i can attach two plugins for macOS 64bit normal version and ea64 one built with cmake .. -DIDA_SDK_DIR=$IDA_SDK_DIR -DEA64=1 if you wanna analyse and test them.

[PeterMatula]

I don't really have a macOS machine to test on. But if it works on macOS, it should work on Linux and Windows as well? What did you have to do to get it working? I did not research this much, so at the moment, I have no idea if you just build it differently, or you need to change the code as well.

[Maroc-OS]

i have updated the build system to support that and really quick changes on code.