Add Custom Key for SOL on webui

To support VT100+ extensions for SOL on webui, add custom key
into xtermjs to handle key Backspace, DEL, HOME, END, INSERT,
PAGE UP, PAGE DOWN, F1 - F12.

Tested By:

Add Custom Key for SOL on webui

To support VT100+ extensions for SOL on webui, add custom key
into xtermjs to handle key Backspace, DEL, HOME, END, INSERT,
PAGE UP, PAGE DOWN, F1 - F12.

Tested By:
After added item "customKeyEnable": true, "keyType" : "VT100+" into
iconfig.json.
Under EFI SHELL: Backspace, DEL, HOME, END, INSERT, PAGE UP, PAGE DOWN,
F1 - F12 keys can work as local keyboard in Web SOL.
Under linux with $TERM=vt100+: Backspace, DEL, HOME, END, INSERT,
PAGE UP, PAGE DOWN, F1 - F12 keys can work as local keyboard in Web SOL.
If not add "customKeyEnable" or "keyType", into config.json, Backspace,
DEL, HOME, END, INSERT, PAGE UP, PAGE DOWN, F1 - F12 keys can work
correctly in linux OS with $TERM=vt220 in SOL.
Other keys such as a-z can always work in SOL no matter "customKeyEnable"
or "keyType" is inserted into config.json.

Change-Id: Ifb196ec37080781033c0d6a3b0688baa7d0080b5
Signed-off-by: Cheng C Yang <cheng.c.yang@linux.intel.com>

show more ...