Change refs for joyent/libuv repo to libuv/libuv

* References to old repository found through grepping
* Replace references from github.com/joyent/libuv to github.com/libuv/libuv
* Fix previous commit by not including whitespace changes

 For issue #1560.
ui: Remove ui_inchar/ui_char_avail

Also:

- Remove NO_CONSOLE_INPUT/NO_CONSULE preprocessor conditionals
- Remove ctrl_c_interrupts variable, check for mapped_ctrl_c directly in
  process_interrupts()
- Move ui_inchar profiling to input_poll which is where Nvim blocks for input.
ui: Remove ui_delay, ui_breakcheck and ui_set_shellsize

These functions only used to call another os_* function, so remove them and
replace all occurences in the project.
ui: Extract mouse.c/mouse.h
ui: Remove redundant ui.h includes

Also move read_error_exit to os/input.c
Merge PR #1565 'Cleanup ui module'
Merge pull request #1562 from Happy-Dude/fix-1560-libuv-refs

Change refs for joyent/libuv repo to libuv/libuv.