Create mixed mags for Sd.Kfz.234/1 and Flakvierling

[Matt Hands]

Trello card

Desired new mag type containing both AP & HE rounds.

[Matt Hands]

Implemented in commits 1045b50 & ac3a6cb

New mag is labelled as "Mixed" on HUD ammo display. It is now primary ammo on both, with AP or HE available as alternative mags that can be loaded for special circumstances. Currently has these arbitrary mag loadouts, which I will change if required:

• 234/ = 15/15/15 mags (Mixed/AP/HE) // was originally 25 AP & 20 HE

• Flakviervling = 12/4/4 mags (Mixed/AP/HE) // was originally 16 AP & 4 HE

Features/changes

• Mixed mags fire alternating HE/AP rounds. I can add a ratio if required, but for now this is a simple bool flag.
• Re-worked functionality to work with new ammo resupply
• HUD displays ammo icon in red when waiting for reload or totally out of mags & can't reload
• Added functionality to work with manual cannon shell reloading (original always auto-reloaded)
• For non-manual reloading, it checks for any alternative round type when out of mags
• 234/1 cannon class is now a DH_ROTankCannon, where original was an ROTankCannon - altered everything to suit
• Falkvierling cannon modified as required, including removing various functions that will now work fine using inheritance from 234/1 & fixed minor bugs

[Andrew Theel]

This belongs on trello, not a bug :P

[Colin Basnett]

For minor adjustments like this, Bitbucket may be the preferred method for tracking this as we can post commit hashes etc.

[Colin Basnett]

Fixed a bug where the Flakvierling 38 had 40 rounds per magazine in commit 2573e8b.