Various bug fixes and small features (#606)

* Fix stray cursor, integer overflows and other bugs

* check for getenvlist error, shorten code

* fix cascade, set info_line before auth, make code clearer and a bug fix

* Add option to turn on numlock at startup

* Fix setting numlock

* Update build.zig

* Custom info text

* Shift+Tab for previous input

* update changelog and res/config

* Some fixes

* update build.zig

* update build.zig again

* Fix xauth command for some shells and fix building in ReleaseSafe

* Use git describe to get dev version str

* revert change to getLockState (it broke the doom animation)

* add new ly error messages. Only try to make path for pam/exe during install when dest_directory is defined + print warning on error.

* add warning message for workaround

src/config/Config.zig

@@ -10,6 +10,7 @@ bg: u8 = 0,
 bigclock: bool = false,
 blank_box: bool = true,
 border_fg: u8 = 8,
+box_title: ?[]const u8 = null,
 clear_password: bool = false,
 clock: ?[:0]const u8 = null,
 console_dev: [:0]const u8 = "/dev/console",
@@ -17,6 +18,7 @@ default_input: Input = .login,
 fg: u8 = 8,
 hide_borders: bool = false,
 hide_key_hints: bool = false,
+initial_info_text: ?[]const u8 = null,
 input_len: u8 = 34,
 lang: []const u8 = "en",
 load: bool = true,
@@ -25,8 +27,9 @@ margin_box_v: u8 = 1,
 max_desktop_len: u8 = 100,
 max_login_len: u8 = 255,
 max_password_len: u8 = 255,
-mcookie_cmd: []const u8 = "/usr/bin/mcookie",
+mcookie_cmd: [:0]const u8 = "/usr/bin/mcookie",
 min_refresh_delta: u16 = 5,
+numlock: bool = false,
 path: ?[:0]const u8 = "/sbin:/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin",
 restart_cmd: []const u8 = "/sbin/shutdown -r now",
 restart_key: []const u8 = "F2",