This adds separate permissions for accessing, creating and destroying of shops.
It also adds a config entry to allow using of a shop even if someone have access to it due to their permissions.
This uses hardcoded widths for the main characters used in Minecraft and might not be precise for some characters but better than the previous 15 char hard limit.
This also makes it possible to input IDs on the sign that are longer than the max sign letters that the plugin uses as that just gets auto corrected back down to the correct amount.
This includes a new price_precision config entry to set the amount of decimal places to allow on a shop sign (set to 2 by default). Thanks to @andrewkm for this idea.
It also fixes an issue where a zero inside the decimal places was removed instead of it's end and also removes the point and zeros from prices that only have trailing zeros to avoid confusion (e.g. in languages that use the decimal point for thousands)
This should fix the issue where the player's short name on the shop sign does not reflect the actual player's name. This works by storing every uuid-username combination together with the associated short name and the last time the player logged in with that combination.
