Fix various typos in code comments (#1670) [skip ci]

Found via `codespell -q 3 -S *.ts,*.xml -L ba,keypair,numer,uint`

app/CMakeLists.txt

@@ -80,7 +80,7 @@ add_library(libolive-editor
 # Remove prefix - prevents CMake calling it "liblibolive-editor"
 set_target_properties(libolive-editor PROPERTIES PREFIX "")
 
-# Add applicaton
+# Add application
 add_executable(olive-editor
   main.cpp
   $<TARGET_OBJECTS:libolive-editor>

app/audio/audiomanager.cpp

@@ -102,7 +102,7 @@ void AudioManager::StartOutput(AudioPlaybackCache *cache, qint64 offset, int pla
   // Move to output manager's thread
   device->moveToThread(&output_thread_);
 
-  // Queue to output manger in other thread
+  // Queue to output manager in other thread
   QMetaObject::invokeMethod(output_manager_,
                             "PullFromDevice",
                             Qt::QueuedConnection,

app/audio/audiovisualwaveform.cpp

@@ -235,7 +235,7 @@ void AudioVisualWaveform::Shift(const rational &from, const rational &to)
 
 AudioVisualWaveform::Sample AudioVisualWaveform::GetSummaryFromTime(const rational &start, const rational &length) const
 {
-  // Find mipmap that requries
+  // Find mipmap that requires
   auto using_mipmap = GetMipmapForScale(length.flipped().toDouble());
 
   double rate_dbl = using_mipmap->first.toDouble();

app/common/commandlineparser.h

@@ -29,7 +29,7 @@
 /**
  * @brief Command-line argument parser
  *
- * You may be wondering why we don't use QCommandLineParser instead of a custom implmentation like
+ * You may be wondering why we don't use QCommandLineParser instead of a custom implementation like
  * this. The reason why is because QCommandLineParser requires a QApplication object of some kind
  * to already have been created before it can parse anything, but we need to be able to control
  * whether a QApplication (GUI-mode) or a QCoreApplication (CLI-mode) is created which is set by

app/common/rational.cpp

@@ -309,7 +309,7 @@ bool rational::operator<(const rational &rhs) const
 
   if (rhs == RATIONAL_MAX
       || *this == RATIONAL_MIN) {
-    // We will always wither be LESS THAN (true) or EQUAL (false)
+    // We will always either be LESS THAN (true) or EQUAL (false)
     return (*this != rhs);
   }
 
@@ -342,7 +342,7 @@ bool rational::operator<=(const rational &rhs) const
 
   if (rhs == RATIONAL_MAX
       || *this == RATIONAL_MIN) {
-    // We will always wither be LESS THAN (true) or EQUAL (true)
+    // We will always either be LESS THAN (true) or EQUAL (true)
     return true;
   }
 

app/widget/slider/base/sliderlabel.cpp

@@ -48,7 +48,7 @@ SliderLabel::SliderLabel(QWidget *parent) :
   // Allow users to tab to this widget
   setFocusPolicy(Qt::TabFocus);
 
-  // Add ccustom context menu
+  // Add custom context menu
   setContextMenuPolicy(Qt::CustomContextMenu);
 }
 

app/widget/viewer/viewerdisplay.h

@@ -263,7 +263,7 @@ private:
   QMatrix4x4 translate_matrix_;
 
   /**
-   * @breif Scale only matrix.
+   * @brief Scale only matrix.
    */
   QMatrix4x4 scale_matrix_;
 

docker/scripts/build_ffmpeg.sh

@@ -6,7 +6,7 @@
 #
 # Uses { command } & pattern for parallelism https://gist.github.com/thenadz/6c0584d42fb007582fbc
 #
-# TOOD: Use advanced options such as LTO? e.g. https://code.videolan.org/videolan/x264/-/blob/master/configure
+# TODO: Use advanced options such as LTO? e.g. https://code.videolan.org/videolan/x264/-/blob/master/configure
 # TODO: Enable debug symbols? (Or is it opt-out?)
 # TODO: Add more ffmpeg libraries? See https://raw.githubusercontent.com/jrottenberg/ffmpeg/master/docker-images/4.2/centos7/Dockerfile