Fix spelling errors

Fixed with:
codespell --ignore-words-list=hist,parm,sur --skip=./core/src/imgui,./core/src/json.hpp,./core/libcorrect,./core/src/spdlog,./misc_modules/discord_integration/discord-rpc,./misc_modules/discord_integration/discord-rpc/include/rapidjson,./source_modules/sddc_source/src/libsddc

core/src/core.cpp

@@ -311,7 +311,7 @@ int sdrpp_main(int argc, char* argv[]) {
     json bandColors = core::configManager.conf["bandColors"];
     core::configManager.release();
 
-    // Assert that the resource directory is absolute and check existance
+    // Assert that the resource directory is absolute and check existence
     resDir = std::filesystem::absolute(resDir).string();
     if (!std::filesystem::is_directory(resDir)) {
         spdlog::error("Resource directory doesn't exist! Please make sure that you've configured it correctly in config.json (check readme for details)");

core/src/dsp/compression.h

@@ -72,7 +72,7 @@ namespace dsp {
             float maxVal = ((float*)_in->readBuf)[maxIdx];
             *scaler = maxVal;
 
-            // Convert to the right type and send it out (sign bit determins pcm type)
+            // Convert to the right type and send it out (sign bit determines pcm type)
             if (type == PCM_TYPE_I8) {
                 volk_32f_s32f_convert_8i((int8_t*)dataBuf, (float*)_in->readBuf, 128.0f / maxVal, count * 2);
                 _in->flush();

core/src/gui/widgets/line_push_image.cpp

@@ -46,7 +46,7 @@ namespace ImGui {
         int oldLineCount = _lineCount;
         _lineCount += count;
 
-        // If new data either fills up or excedes the limit, reallocate
+        // If new data either fills up or exceeds the limit, reallocate
         // TODO: Change it to avoid bug if count >= reservedIncrement
         if (_lineCount > reservedCount) {
             printf("Reallocating\n");

core/src/utils/new_networking.h

@@ -6,7 +6,7 @@
 #include <condition_variable>
 
 /*
-    Ryzerth's Epic Networking Functins
+    Ryzerth's Epic Networking Functions
 */
 
 namespace net {