docs: Updated docs for 2.0.0 version

docs/comparing.md

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+
+* `addEventHandler` replaced with decorator [event](functions/event/event.md)
+```python
+@pyg2o.event('onInit')
+async def evtInitFirst():
+    print('Hello')
+    
+@pyg2o.event('onInit', 100)       # '100' is priority
+async def evtInitSecond():
+    print('World')
+```
+---
+* Positional arguments inside event handles replaced with keyword arguments (see names of all keywords on the each event page)
+```python
+@pyg2o.event('onPlayerChangeColor')
+async def evtColor(playerid, r, g, b):
+    pass
+```
+---
+* `callEvent` now also requires to pass keyword arguments instead of positional arguments
+```python
+@pyg2o.event('MyTestEvent')
+async def testEvt(name, id):
+    print(name, id)
+    
+g2o.callEvent('MyTestEvent', name = 'aurumvorax', id = 15)
+# OR
+g2o.callEvent('MyTestEvent', {'name': 'aurumvorax', 'id': 15})
+# OR
+args = {'name': 'aurumvorax', 'id': 15}
+asyncio.create_task(pyg2o.callEvent('MyTestEvent', args))
+```
+---
+* `cancelEvent` temporarily disabled
+---
+* `isEventCancelled` replaced with built-in function property `cancelled`, alongside with the `eventName`
+```python
+@pyg2o.event('onPlayerDropItem')
+async def evtDrop(**kwargs):
+    print(evtDrop.cancelled)
+    print(evtDrop.eventName)
+```
+---
+Now all constants should be called via **Constant** class
+```pyton
+import pyg2o
+
+@pyg2o.event('onInit')
+async def evt_init():
+    print(pyg2o.Constant.SERVER_SIDE)
+```
+* Following functions and classes have been removed <sub><sup>RIP :(</sub></sup>
+
+    * `md5`
+    * `sha1`
+    * `sha256`
+    * `sha384`
+    * `sha512`
+    * `setReloadCallback`
+    * `setUnloadCallback`
+    * `getTimerExecuteTimes`
+    * `getTimerInterval`
+    * `killTimer`
+    * `setTimer`
+    * `setTimerExecuteTimes`
+    * `setTimerInterval`
+    * `sscanf`
+    * `hexToRgb`
+    * `rgbToHex`
+    * `getTickCount`
+    * `eventValue`
+    * `getPlayerMagicLevel`
+    * `setPlayerMagicLevel`
+    * `Packet`
+    * `Way`
+    * `NpcAction`
+    
+* Following constants has been removed:
+
+    * `UNRELIABLE`
+    * `UNRELIABLE_SEQUENCED`
+    * `RELIABLE`
+    * `RELIABLE_SEQUENCED`
+    * `RELIABLE_ORDERED`
+--- 
+* All functions and events that returned/passed a `null` in the Squirrel, now passes an empty string. Most notable in this list are all equipment related functions and events
+    * `onPlayerEquipAmulet`
+    * `onPlayerEquipArmor`
+    * `onPlayerEquipBelt`
+    * `onPlayerEquipHandItem`
+    * `onPlayerEquipHelmet`
+    * `onPlayerEquipMeleeWeapon`
+    * `onPlayerEquipRangedWeapon`
+    * `onPlayerEquipRing`
+    * `onPlayerEquipShield`
+    * `onPlayerEquipSpell`
+    * `getPlayerAmulet`
+    * `getPlayerArmor`
+    * `getPlayerBelt`
+    * `getPlayerHelmet`
+    * `getPlayerMeleeWeapon`
+    * `getPlayerRangedWeapon`
+    * `getPlayerRing`
+    * `getPlayerShield`
+    * `getPlayerSpell`