Adjusted Weight Classes

A few changes to weight classes to give some love to mechs that are hit hard by being just over weight class thresholds, despite being as agile as their lighter cousins.

The guidelines are (based on tabletop speeds):

1. Any mech with walk speed 7 (190m) or above is classified no heavier than light.

2. Any mech with walk speed 5 (150m) or above is classified no heavier than medium.

3. Any mech with walk speed 4 (120m) or above is classified no heavier than heavy.

Note this doesn't go the other way. A Panther is not now a heavy mech, and an Urbanmech is not now an assault mech!

The reason for these guidelines is that mechs with these speeds and above these weight classes generally have no more or even less tonnage available, so are actually comparable in firepower to their lighter cousins.

Based on these guidelines, the following changes have been made:

1. Cicada: Medium -> Light

2. Dragon + Quickdraw: Heavy -> Medium

3. Banshee + Battlemaster + Victor + Zeus: Assault -> Heavy

All stability thresholds for these mechs have been reduced to their new weight class, except for the Cicada-2A, which, with less free space for armour and weapons than a Locust, I thought needed all the help it could get. Generally speaking though the increased initiative will more than compensate for the reduced stability I suspect. In addition, mediums and lights are harder to hit, so mechs moved into these categories get further bonuses to compensate for a stability loss.

Note I haven't been able to change the Cyclops as being a DLC mech it doesn't seem to appear as an XML file in the "chassis" directory. Arguably the battle computer variant shouldn't get a boost as it already gives itself an initiative boost but probably the non battle computer variant could use some help.

These changes do not affect how mechs spawn in the OpFor, with two exceptions: Cicadas will now be classed as lights for spawn purposes and Quickdraws as mediums. This is as both of these are designs with low melee damage and their stock designs are outclassed by other mechs in the weight class below them.

As is usual with mods, you'll need BTML and Modtek installed. Install instructions for those are here: https://github.com/janxious/ModTek/wiki/The-Drop-Dead-Simple-Guide-to-Installing-BTML-&-ModTek-&-ModTek-mods.