sysutils/xplr: update to 0.19.0

Changes & fixes
-BREAKING: The builtin modes cannot be accessed using space separated names
anymore. Use underscore separated mode names.
For e.g. SwitchModeBuiltin: create file becomes SwitchModeBuiltin: create_file
and so on.
-Fixed a bug with handling tab key in the input buffer.
-Added xplr.config.general.global_key_bindings to define a set of key bindings
that are available by default in every mode. e.g esc and ctrl-c.
-Added new builtin mode go_to_path which can be used for typing or pasting
paths to enter into or to focus on. Type g p to enter this mode.
-Added basic tab completion support for the go_to_path, create_file,
create_directory, rename and duplicate_as modes.
-Use the builtin function xplr.fn.builtin.try_complete_path to add easy tab
completion support into your own configuration.
-Fixed syncing current working directory with OSC 7 compatible terminals (e.g.
Wezterm).
-The NO_COLOR environment variable also disables OSC 7.
-Significantly optimized regex based search and filter.
-The files table is a little compact now.
-Removed boilerplate config from the default init.lua.
-Minor input prompt related improvements in different modes.

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