Disable `lightmapper_rd` module in non-editor builds (and in Android editor)

This is consistent with `xatlas_unwrap`, which isn't enabled in non-editor
builds and the Android editor either. There is currently no way to
use the lightmapper in a non-editor build anyway, as it doesn't expose
any methods (and even if there was, there would be no way to perform
UV2 unwrapping in the exported project).

This reduces binary size of a stripped Linux x86_64 export template
build by ~164 KB.

This also moves the PrimitiveMesh texel size project setting
so that it's defined when the module is disabled,
and adds a property hint to it.

modules/lightmapper_rd/config.py

@@ -1,5 +1,5 @@
 def can_build(env, platform):
-    return True
+    return env.editor_build and platform not in ["android", "ios"]
 
 
 def configure(env):

modules/lightmapper_rd/register_types.cpp

@@ -58,7 +58,6 @@ void initialize_lightmapper_rd_module(ModuleInitializationLevel p_level) {
 	GLOBAL_DEF("rendering/lightmapping/bake_quality/high_quality_probe_ray_count", 512);
 	GLOBAL_DEF("rendering/lightmapping/bake_quality/ultra_quality_probe_ray_count", 2048);
 	GLOBAL_DEF("rendering/lightmapping/bake_performance/max_rays_per_probe_pass", 64);
-	GLOBAL_DEF("rendering/lightmapping/primitive_meshes/texel_size", 0.2);
 #ifndef _3D_DISABLED
 	GDREGISTER_CLASS(LightmapperRD);
 	Lightmapper::create_gpu = create_lightmapper_rd;

servers/rendering_server.cpp

@@ -2983,6 +2983,7 @@ void RenderingServer::init() {
 	GLOBAL_DEF("rendering/limits/global_shader_variables/buffer_size", 65536);
 
 	GLOBAL_DEF(PropertyInfo(Variant::FLOAT, "rendering/lightmapping/probe_capture/update_speed", PROPERTY_HINT_RANGE, "0.001,256,0.001"), 15);
+	GLOBAL_DEF(PropertyInfo(Variant::FLOAT, "rendering/lightmapping/primitive_meshes/texel_size", PROPERTY_HINT_RANGE, "0.001,100,0.001"), 0.2);
 
 	GLOBAL_DEF(PropertyInfo(Variant::INT, "rendering/global_illumination/sdfgi/probe_ray_count", PROPERTY_HINT_ENUM, "8 (Fastest),16,32,64,96,128 (Slowest)"), 1);
 	GLOBAL_DEF(PropertyInfo(Variant::INT, "rendering/global_illumination/sdfgi/frames_to_converge", PROPERTY_HINT_ENUM, "5 (Less Latency but Lower Quality),10,15,20,25,30 (More Latency but Higher Quality)"), 5);