Feature/mission refactor (#26)

* Refactored Mission classes to add Missions other than trigger zone missions. (eg. Runway Strikes, Resupply etc.)
* Runway strike initial POC
Co-authored-by: dutchie032 <dutchie032>

_docs/pages/reference.html

@@ -292,10 +292,25 @@
                     Missions can be randomized using the <span class="inline-lua"><span class="lua-variable">RANDOMMISSION</span></span> prefix. <br />
                     Spearhead will pick one random mission from zones with the same name.
                 </p>
+
+                <h2>Runway Bombing</h2>
+                <p>
+                    Runway bombing can be a very effective OCA tactic. With Spearhead we've tried adding as much logic and detail to it so it will feel as engaging as possible. <br/>
+
+                    Firstly, the runway is split up in 5 sections and only sections 2, 3 and 4 are then actually tracked. <br/>
+
+                    <span style="font-family: Consolas, Monaco, 'Lucida Console', monospace;">
+                        +-----------+-----------+-----------+-----------+-----------+ <br/>
+                        | Section 1 | Section 2 | Section 3 | Section 4 | Section 5 | <br/>
+                        +-----------+-----------+-----------+-----------+-----------+ <br/>
+                    </span>
+                    
+
+
+                </p>
             </div>
         </div>
 
-        <div style="clear: both;"></div>
     </main>
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