feat(states): WIP handler for cacheing and setting states

Provide a centralised non-framework dependent interval to
track and perform tasks based on certain variables, such as
if the player is driving, in a vehicle, or walking.

Will later add a statebag change handler with callbacks, to
easily listen for state changes and use them in third-party
resources.

resource/states/client.lua

@@ -0,0 +1,63 @@
+local cache = {}
+local player = LocalPlayer.state
+local states = {
+	['vehicle'] = true,
+	['driver'] = true
+}
+
+function cache:set(key, value)
+	if value ~= self[key] then
+		self[key] = value
+
+		if states[key] then player:set(key, value, false) end
+	end
+end
+
+function cache:getPed()
+	local ped = PlayerPedId()
+	if ped ~= self.ped then
+		self.ped = ped
+	end
+end
+
+function cache:getVehicle()
+	local vehicle = GetVehiclePedIsIn(self.ped, false)
+	if vehicle > 0 then
+		if vehicle ~= self.vehicle then
+			self:set('vehicle', vehicle)
+
+			if GetPedInVehicleSeat(vehicle, -1) == self.ped then
+				self:set('driver', true)
+			else
+				self:set('driver', false)
+			end
+		end
+	else self:set('vehicle', nil) end
+end
+
+function cache:onFoot()
+	-- print('on foot')
+end
+
+function cache:inVehicle()
+	if self.driver then
+		-- print('driving vehicle')
+	else
+		-- print('in vehicle')
+	end
+end
+
+CreateThread(function()
+	while true do
+		cache:getPed()
+		cache:getVehicle()
+
+		if not cache.vehicle then
+			cache:onFoot()
+		else
+			cache:inVehicle()
+		end
+
+		Wait(100)
+	end
+end)