* compile_ok

Issues fixed:
(1) update .config: select FINSH_USING_SYMTAB
(2) add rt_size_t in rtconfig_project.h
(3) fix finsh problems of using sym table
(4) update .project to include ipc source codes.
Todo list:
(1) automate the build source selection of ccs and reconcile it with scons

* change compiler

* msh can run now

the key step is to swap the order of rt_interrupt_nest -- and RT_OBJECT_HOOK_CALL(rt_interrupt_leave_hook,()) in irq.c. This is an improvised solution and an issue has been raised.

* Update 2837x_FLASH_lnk_cpu1.cmd

The original one is also fine. Just to make it more rigorous since FSymTab is in data section.

* update readme.md

Complier selection and maintainer update.
Co-authored-by: YuQi <qiyu_sjtu@163.com>