Replace deprecated functions with newer ones

Also replaces `depends.txt` and `description.txt` with `mod.conf`.

.luacheckrc

@@ -8,4 +8,5 @@ read_globals = {
 
 globals = {
 	"default",
+	"player_api",
 }

depends.txt

@@ -1 +0,0 @@
-default

description.txt

@@ -1,2 +0,0 @@
-A mod for Minetest allowing you to watch other players in their 3rd person view.
-You're invisible and undetectable for the players when you're in this mode.

init.lua

@@ -19,7 +19,7 @@ local function unwatching(name)
 
 	if watcher and default.player_attached[name] == true then
 		watcher:set_detach()
-		default.player_attached[name] = false
+		player_api.player_attached[name] = false
 		watcher:set_eye_offset(vector.new(), vector.new())
 		watcher:set_nametag_attributes({color = {a = 255, r = 255, g = 255, b = 255}})
 
@@ -38,10 +38,10 @@ local function unwatching(name)
 
 		local pos = original_pos[watcher]
 		if pos then
-			-- setpos seems to be very unreliable
+			-- set_pos seems to be very unreliable
 			-- this workaround helps though
 			minetest.after(0.1, function()
-				watcher:setpos(pos)
+				watcher:set_pos(pos)
 			end)
 			original_pos[watcher] = nil
 		end
@@ -50,7 +50,7 @@ end
 
 minetest.register_chatcommand("watch", {
 	params = "<to_name>",
-	description = "watch a given player",
+	description = "Watch a given player",
 	privs = {watch = true},
 	func = function(name, param)
 		local watcher = minetest.get_player_by_name(name)
@@ -58,13 +58,13 @@ minetest.register_chatcommand("watch", {
 		local privs = minetest.get_player_privs(name)
 
 		if target and watcher ~= target then
-			if default.player_attached[name] == true then
+			if player_api.player_attached[name] == true then
 				unwatching(param)
 			else
-				original_pos[watcher] = watcher:getpos()
+				original_pos[watcher] = watcher:get_pos()
 			end
 
-			default.player_attached[name] = true
+			player_api.player_attached[name] = true
 			watcher:set_attach(target, "", vector.new(0, -5, -20), vector.new())
 			watcher:set_eye_offset(vector.new(0, -5, -20), vector.new())
 			watcher:set_nametag_attributes({color = {a = 0}})
@@ -81,7 +81,7 @@ minetest.register_chatcommand("watch", {
 			minetest.set_player_privs(name, privs)
 
 			return true, "Watching '" .. param .. "' at "..
-				minetest.pos_to_string(vector.round(target:getpos()))
+				minetest.pos_to_string(vector.round(target:get_pos()))
 		end
 
 		return false, "Invalid parameter ('" .. param .. "')."
@@ -89,7 +89,7 @@ minetest.register_chatcommand("watch", {
 })
 
 minetest.register_chatcommand("unwatch", {
-	description = "unwatch a player",
+	description = "Unwatch a player",
 	privs = {watch=true},
 	func = function(name, param)
 		unwatching(name)

mod.conf

@@ -1 +1,6 @@
 name = spectator_mode
+depends = default, player_api
+description = """
+A mod for Minetest allowing you to watch other players in their 3rd person view.
+You're invisible and undetectable for the players when you're in this mode.
+"""