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

Now these functions only call another os-specific function, so remove them and
replace all occurences in the project.