Make resource trickle info for garrisoned units visible in template viewer

[Langbart]

to reproduce (Barrack)

• start a map with any civ
• build a Barrack and garrison an Infantry unit in it
• the unit receives a XP trickle (added with [23541])
• no information about the quantity and time unit is given

to reproduce (Corral)

• start a map with any civ
• build a Corral and garrison a Domestic Animal unit in it
• the player receives a Food trickle (added with [27244][27487])
• no information about the time unit is given

expected information

• the trickle and time unit is exposed in the template viewer with an icon, for example:
  • 1 / 2 seconds
  • 3 / 5 seconds

possible solution(s)

• (A) write the info into the aura description
  • Not preferred, text needs to be translated and relevant information is harder to spot due to inconsistent length of text and missing icons
• (B) move the garrisoned trickle into the GarrisonHolder, as it is done for the BuffHeal

related

• ​Phab:D1245 (22/Jan/18)
  • Discussion about Aura vs GarrisonHolder

nitpick

• replace the word Health with an icon, for example
  • 1 / second (icon: auras/heal.png)
  • 1 / second (icon: auras/health_bonus.png)
  • 1 / second (icon: origin unknown)