hltas 0.9.0

Reading and writing Half-Life TAS scripts (`.hltas`).
Documentation
version 1
frames
s00-------|------|------|0.010000001|-|-|100
s01-------|------|------|0.010000001|-|-|100
s02-------|------|------|0.010000001|-|-|100
s03-------|------|------|0.010000001|180|-|100
s04-------|------|------|0.010000001|10 20|-|100
s05-------|------|------|0.010000001|180|-|100
s06-------|------|------|0.010000001|10|-|100
s07-------|------|------|0.010000001|10|-|100

// Constant yawspeed
s40-------|------|------|0.010000001|1|-|100
s41-------|------|------|0.010000001|2|-|100

// Maximum accelerated yaw offset
s50-------|------|------|0.010000001|- 0 1 10|-|100
s51-------|------|------|0.010000001|- 0 2 20|-|100
s52-------|------|------|0.010000001|- 0 1 10|-|100
s53-------|------|------|0.010000001|10 0 2 20|-|100
s54-------|------|------|0.010000001|1 2 0 2 20|-|100
s55-------|------|------|0.010000001|1 0 2 20|-|100
s56-------|------|------|0.010000001|20 0 2 20|-|100
s57-------|------|------|0.010000001|20 0 2 20|-|100