config: make the monitor properties & rules available in global tables

This allows altering monitor properties or adding rules in different
lua files that get loaded before 90-enable*.lua

src/config/config.lua.d/30-alsa-monitor.lua

 -- ALSA monitor config file --
 
-local properties = {
+alsa_monitor = {}
+
+alsa_monitor.properties = {
   -- Create a JACK device. This is not enabled by default because
   -- it requires that the PipeWire JACK replacement libraries are
   -- not used by the session manager, in order to be able to
@@ -13,7 +15,7 @@ local properties = {
   --["alsa.reserve.application-name"] = "WirePlumber",
 }
 
-local rules = {
+alsa_monitor.rules = {
   -- An array of matches/actions to evaluate.
   {
     -- Rules for matching a device or node. It is an array of
@@ -96,14 +98,14 @@ local rules = {
   }
 }
 
-function enable_alsa()
+function alsa_monitor.enable()
   -- The "reserve-device" module needs to be loaded for reservation to work
-  if properties["alsa.reserve"] then
+  if alsa_monitor.properties["alsa.reserve"] then
     load_module("reserve-device")
   end
 
   load_monitor("alsa", {
-    properties = properties,
-    rules = rules,
+    properties = alsa_monitor.properties,
+    rules = alsa_monitor.rules,
   })
 end

src/config/config.lua.d/30-bluez-monitor.lua

 -- Bluez monitor config file --
 
-local properties = {
+bluez_monitor = {}
+
+bluez_monitor.properties = {
   -- MSBC is not expected to work on all headset + adapter combinations.
   --["bluez5.msbc-support"] = true,
   --["bluez5.sbc-xq-support"] = true,
@@ -19,7 +21,7 @@ local properties = {
   --["bluez5.codecs"] = "[ sbc aac ldac aptx aptx_hd ]",
 }
 
-local rules = {
+bluez_monitor.rules = {
   -- An array of matches/actions to evaluate.
   {
     -- Rules for matching a device or node. It is an array of
@@ -59,9 +61,9 @@ local rules = {
   },
 }
 
-function enable_bluetooth()
+function bluez_monitor.enable()
   load_monitor("bluez5", {
-    properties = properties,
-    rules = rules,
+    properties = bluez_monitor.properties,
+    rules = bluez_monitor.rules,
   })
 end

src/config/config.lua.d/30-v4l2-monitor.lua

 -- V4L2 monitor config file --
 
-local properties = { }
+v4l2_monitor = {}
 
-local rules = {
+v4l2_monitor.properties = { }
+
+v4l2_monitor.rules = {
   -- An array of matches/actions to evaluate.
   {
     -- Rules for matching a device or node. It is an array of
@@ -39,9 +41,9 @@ local rules = {
   },
 }
 
-function enable_v4l2()
+function v4l2_monitor.enable()
   load_monitor("v4l2", {
-    properties = properties,
-    rules = rules,
+    properties = v4l2_monitor.properties,
+    rules = v4l2_monitor.rules,
   })
 end

src/config/config.lua.d/90-enable-audio-all.lua

 enable_audio()
-enable_alsa()
-enable_bluetooth()
+alsa_monitor.enable()
+bluez_monitor.enable()

src/config/config.lua.d/90-enable-video.lua

-enable_v4l2()
+v4l2_monitor.enable()