1.6.3: Training overhaul + events fixes

• Changed: In-flight training now works differently: kerbals now always gradually increase their training level for the vessels they are in, without a hard cap but with diminishing returns, so that they never actually reach 100%. The speed of training depends on the kerbal's stupidity (the higher, the slower), current situation (more challenging locations yield more training, and being on the ground on Kerbin stops training) and the current training level. See more details in readme.
• Changed: KSC training caps have been reduced. Based on the Astronaut Level facility, they've been reduced to 30%, 50% and 60% for levels 1 to 3 (from 40%, 60% and 75%, respectively).
• Changed: EVA now also requires training, which currently can only be done in flight.
• Changed: EVA health factor reduced from 10 to 8 HP/day to compensate for the above change.
• Changed: Default Stupidity factor for training speed is now 50%
• Improved: Training Info UI
• Fixed: Events would almost never happen. Also event checks are conducted much more often now, which is especially important for probable events.