move wlr dependent input handler to sway

Moves input handling code that uses headers from wlroots from the common
code to sway proper, to allow for removing the wlroots dependency from
clients

include/util.h

@@ -16,27 +16,6 @@ int wrap(int i, int max);
  */
 int numlen(int n);
 
-/**
- * Get modifier mask from modifier name.
- *
- * Returns the modifer mask or 0 if the name isn't found.
- */
-uint32_t get_modifier_mask_by_name(const char *name);
-
-/**
- * Get modifier name from modifier mask.
- *
- * Returns the modifier name or NULL if it isn't found.
- */
-const char *get_modifier_name_by_mask(uint32_t modifier);
-
-/**
- * Get an array of modifier names from modifier_masks
- *
- * Populates the names array and return the number of names added.
- */
-int get_modifier_names(const char **names, uint32_t modifier_masks);
-
 /**
  * Get the pid of a parent process given the pid of a child process.
  *