add operating definitions of UART0 to UART5
support UART0 to UART5 straightly
add RT_USING_UARTx and set console via uart0
add CM_PER_UARTx_CLKCTRL
friendly for uart count under 6
[Finsh] remove the .mo display when command is not found.
[scons] fix library suffix issue.
simulator: fix compile errors in nand driver(512+16)
Merge pull request #239 from prife/master

simulator: fix compile errors in nand driver(512+16)
[ci-skip]
[scons] Use a single path for group (ci build)
[scons] Change attribution for wizard.py (ci build)
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
[git] Add *.lib/*.a into git ignore list (ci build)
Update USB Device Stack to support more device controllers;
Pass USB CV test verification;
Code cleanup;
Add INIT_FS_EXPORT for RAM file system
[scons] Add the library to the group when used buildlib building
[DFS] Add ramfs initialization in components initialization procedure
add JavaScript Interpreter
Merge pull request #227 from RTsien/master

Add supports for UART0 to UART5 of beaglebone(black)