Fix build on Windows

- Force encoding to UTF-8
 - Fix npm not being found on the path
 - Test building common/web on OSX and Windows

projects/core/src/main/resources/data/computercraft/lua/rom/apis/settings.lua

@@ -213,16 +213,16 @@ end
 -- Existing settings will be merged with any pre-existing ones. Conflicting
 -- entries will be overwritten, but any others will be preserved.
 --
--- @tparam[opt] string sPath The file to load from, defaulting to `.settings`.
+-- @tparam[opt=".settings"] string path The file to load from.
 -- @treturn boolean Whether settings were successfully read from this
 -- file. Reasons for failure may include the file not existing or being
 -- corrupted.
 --
 -- @see settings.save
--- @changed 1.87.0 `sPath` is now optional.
-function load(sPath)
-    expect(1, sPath, "string", "nil")
-    local file = fs.open(sPath or ".settings", "r")
+-- @changed 1.87.0 `path` is now optional.
+function load(path)
+    expect(1, path, "string", "nil")
+    local file = fs.open(path or ".settings", "r")
     if not file then
         return false
     end
@@ -255,14 +255,14 @@ end
 -- This will entirely overwrite the pre-existing file. Settings defined in the
 -- file, but not currently loaded will be removed.
 --
--- @tparam[opt] string sPath The path to save settings to, defaulting to `.settings`.
+-- @tparam[opt=".settings"] string path The path to save settings to.
 -- @treturn boolean If the settings were successfully saved.
 --
 -- @see settings.load
--- @changed 1.87.0 `sPath` is now optional.
-function save(sPath)
-    expect(1, sPath, "string", "nil")
-    local file = fs.open(sPath or ".settings", "w")
+-- @changed 1.87.0 `path` is now optional.
+function save(path)
+    expect(1, path, "string", "nil")
+    local file = fs.open(path or ".settings", "w")
     if not file then
         return false
     end