Rename windows libraries to drop the lib prefix, as this is not customary on Windows.

Drop `universal.` suffix on macOS, as this is implied if there is no distinction between arches.
Add more targets for the .gdextension file, including web, more linux targets, and separate single and double builds.

SConstruct

@@ -53,15 +53,18 @@ if env["target"] in ["editor", "template_debug"]:
     except AttributeError:
         print("Not including class reference as we're targeting a pre-4.3 baseline.")
 
-file = "{}{}{}".format(libname, env["suffix"], env["SHLIBSUFFIX"])
+# .dev doesn't inhibit compatibility, so we don't need to key it.
+# .universal just means "compatible with all relevant arches" so we don't need to key it.
+suffix = env['suffix'].replace(".dev", "").replace(".universal", "")
+
+lib_filename = "{}{}{}{}".format(env.subst('$SHLIBPREFIX'), libname, suffix, env.subst('$SHLIBSUFFIX'))
 
-libraryfile = "bin/{}/{}".format(env["platform"], file)
 library = env.SharedLibrary(
-    libraryfile,
+    "bin/{}/{}".format(env['platform'], lib_filename),
     source=sources,
 )
 
-copy = env.InstallAs("{}/bin/{}/lib{}".format(projectdir, env["platform"], file), library)
+copy = env.Install("{}/bin/{}/".format(projectdir, env["platform"]), library)
 
 default_args = [library, copy]
 Default(*default_args)