janitor: Go over our spell checking setup

* Extend the cspell word list
* Remove those extensions from individual source files
* white-list licenses and such as we should not meddle with those
* Fix spelling

api/cpp/docs/cmake.md

@@ -1,5 +1,5 @@
 <!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
-<!-- cSpell: ignore ccmake dslint femtovg skia winit -->
+<!-- cSpell: ignore ccmake dslint femtovg -->
 
 # Installing Or Building With CMake
 
@@ -43,7 +43,7 @@ First you need to install the prerequisites:
 
 * Install Rust by following the [Rust Getting Started Guide](https://www.rust-lang.org/learn/get-started). If you already
   have Rust installed, make sure that it's at least version 1.60 or newer. You can check which version you have installed
-  by running `rustc --version`. Once this is done, you should have the ```rustc``` compiler and the ```cargo``` build system installed in your path.
+  by running `rustc --version`. Once this is done, you should have the `rustc` compiler and the `cargo` build system installed in your path.
 * **[cmake](https://cmake.org/download/)** (3.21 or newer)
 * A C++ compiler that supports C++20 (e.g., **MSVC 2019 16.6** on Windows)
 

api/cpp/include/slint-platform.h

@@ -82,7 +82,7 @@ private:
 ///
 /// If the implementation of this bi-directional message passing protocol is incomplete, the user
 /// may experience unexpected behavior, or the intention of the developer calling functions on the
-/// Window API may not be fullfilled.
+/// Window API may not be fulfilled.
 ///
 /// Your WindowAdapter subclass must hold a renderer (either a SoftwareRenderer or a SkiaRenderer).
 /// In the renderer() method, you must return a reference to it.

api/cpp/include/slint_image.h

@@ -145,7 +145,7 @@ public:
     ///
     /// Safety:
     ///
-    /// This function is unsafe because invalid texture ids may lead to undefind behavior in OpenGL
+    /// This function is unsafe because invalid texture ids may lead to undefined behavior in OpenGL
     /// drivers. A valid texture id is one that was created by the same OpenGL context that is
     /// current during any of the invocations of the callback set on
     /// [`Window::set_rendering_notifier()`]. OpenGL contexts between instances of [`slint::Window`]

api/cpp/lib.rs

@@ -152,7 +152,7 @@ mod allocator {
             if align <= core::mem::size_of::<usize>() {
                 malloc(layout.size()) as *mut u8
             } else {
-                // Ideally we'd use alligned_alloc, but that function caused heap corruption with esp-idf
+                // Ideally we'd use aligned_alloc, but that function caused heap corruption with esp-idf
                 let ptr = malloc(layout.size() + align) as *mut u8;
                 let shift = align - (ptr as usize % align);
                 let ptr = ptr.add(shift);

api/cpp/platform.rs

@@ -181,7 +181,7 @@ struct CppPlatform {
     window_factory: unsafe extern "C" fn(PlatformUserData, *mut WindowAdapterRcOpaque),
     #[cfg(not(feature = "std"))]
     duration_since_start: unsafe extern "C" fn(PlatformUserData) -> u64,
-    // silent the warning depite `Clipboard` is a `#[non_exhaustive]` enum from another crate.
+    // silent the warning despite `Clipboard` is a `#[non_exhaustive]` enum from another crate.
     #[allow(improper_ctypes_definitions)]
     set_clipboard_text: unsafe extern "C" fn(PlatformUserData, &SharedString, Clipboard),
     #[allow(improper_ctypes_definitions)]