More bugfixes

- Added switft swim/chlorophyll speed boost in rain/sun, the boost is only processed in the damage calculator and not displayed on the interface (same thing than for SpeDef boost in Sandstorm)

- The visualizer is supposed to refresh at the begining of the betting phase and when the match starts. Last patch broke that. It is now working properly

- Errors in how and when I was rounding the damage during calculations made them sometimes slightly inaccurate. To fix this I had to completely rearrange the damage calculations code. Everything is now rounded correctly and calculated in the correct order