Results: Implement namespaced, type-safe results.

Because I was working on multiple things at once, this commit also:
- Adds wrappers for/linker flags to wrap CXX exceptions to make them
  abort. This saves ~0x8000 of memory in every system module.
- Broadly replaces lines of the pattern if (cond) { return ResultX; }
  with R_UNLESS(!cond, ResultX());.
- Reworks the R_TRY_CATCH macros (and the result macros in general).

stratosphere/boot/source/boot_pmic_driver.cpp

@@ -34,7 +34,7 @@ namespace sts::boot {
         u8 power_status;
         R_TRY(this->GetPowerStatus(&power_status));
         *out = (power_status & 0x02) != 0;
-        return ResultSuccess;
+        return ResultSuccess();
     }
 
     Result PmicDriver::GetPowerIntr(u8 *out) {
@@ -56,7 +56,7 @@ namespace sts::boot {
         u8 power_intr;
         R_TRY(this->GetPowerIntr(&power_intr));
         *out = (power_intr & 0x08) != 0;
-        return ResultSuccess;
+        return ResultSuccess();
     }
 
     Result PmicDriver::ShutdownSystem(bool reboot) {