v0.0.0.70 - Droid updates (build & dismantle)

Hi folks, 

A little update just improving  droids and mining bots.

• Additional mining bots can be created from the mining unit.
• Droids and mining bots can now be dismantled (if you have a droid maintenance bay (for droids) or a mining unit (for mining bots)), once they finish currently assigned job. 
  
• You can now see the amount droids are picking up and dropping off as it happens (was previously done at the end of a timer). 
• Balancing (mining bots now carry less).
• More noticeable when droids charging (clearer gfx).

Sorry it's been a while, had other projects on the go. Next update should be much quicker, looking at more messages and tooltips next, for some of these droids changes. initially tooltips for - costs to repair and why you cant delete a droid/mining bot.  Will also start thinking about how to customise jobs that droids do.

Nick