Add descriptions to the template labels

[szapp]

For accessibility and to avoid documenting the templates elsewhere, let's add concise descriptions (= one liners that can be read at a glance from the labels list) to the template labels.

• [x] add dialog conditions
• [ ] add item transaction to dialog
• [ ] change daily routine waypoint
• [ ] change dialog choice text
• [ ] change dialog line speaker
• [ ] change dialog subtitles
• [ ] change info instance description
• [ ] change info instance variable (int)
• [ ] change item instance description
• [ ] change item instance name
• [ ] change item instance text
• [ ] change item instance variable (int)
• [ ] change item instance variable (string)
• [ ] change npc instance variable (int)
• [ ] change npc property (non-volatile)
• [ ] change text of log entry
• [ ] change vob location
• [ ] change vob property
• [ ] create log topic in dialog function
• [ ] default gamesave auto
• [ ] default gamesave manual
• [ ] default session auto
• [ ] default session manual
• [ ] extend dialog function
• [ ] modify daily routine
• [ ] modify dialog conditions
• [ ] modify dialog function
• [ ] modify engine function
• [ ] modify item transaction in dialog
• [ ] modify npc function
• [ ] modify npc state
• [ ] rearrange dialog choices
• [ ] rename log topic
• [ ] rename npc
• [ ] replace element in string array constant
• [ ] replace text constant