feat: Resolve low framerate during song select for IIDX32+

> caused by bad code around thumbnail fetching logic including file checks in every draw call, see #4
> added `hooks::wmisc` for linux specific minor performance fixes and similar

hooks/wmischook.cpp

@@ -0,0 +1,72 @@
+#include "wmischook.h"
+#include "util/logging.h"
+#include "util/detour.h"
+#include "util/sigscan.h"
+
+
+namespace hooks::wmisc::thumbnail
+{
+typedef bool (*ThumExists_t)(void *titleUTF_getter, int32_t id, char flag);
+static ThumExists_t ThumExists;
+
+bool on_thum_exists_(void *titleUTF_getter, int32_t id, char flag)
+{
+    static std::unordered_map<int32_t, bool> thumids;
+    auto it = thumids.find(id);
+    if (it != thumids.end())
+    {
+        return it->second;
+    }
+    else
+    {
+        log_misc("hooks::wmisc::thumbnail", "Caching state for [{}]", id);
+        it = thumids.insert({id, ThumExists(titleUTF_getter, id, flag)}).first;
+    }
+
+    return it->second;
+}
+
+void run(HINSTANCE hmodule)
+{
+    // Reverse lookup function head (PUSH RDI) for ThumExists() specific signature, quietly fail if invalid
+    intptr_t beg, match, TX_ThumExists;
+    TX_ThumExists = beg = match = find_pattern_from(hmodule, "83f801750c4084ff750732c0", "XXXXXXXXXXXX", 0, 0, 0);
+    while (beg > sizeof(intptr_t) && match >= TX_ThumExists)
+    {
+        beg--;
+        match = find_pattern_from(hmodule, "4057", "XX", 0, 0, beg - reinterpret_cast<intptr_t>(hmodule));
+    }
+    TX_ThumExists = match;
+    log_info("hooks::wmisc::thumbnail", "Hooking ThumExists({})", reinterpret_cast<void *>(TX_ThumExists));
+    detour::trampoline_try(reinterpret_cast<void *>(TX_ThumExists), reinterpret_cast<void *>(on_thum_exists_), reinterpret_cast<void **>(&ThumExists));
+}
+}
+
+namespace hooks::wmisc
+{
+static constexpr unsigned int by_model(const char *model, int h = 0)
+{
+    return !model[h] ? 5381 : (by_model(model, h + 1) * 33) ^ model[h];
+}
+static constexpr unsigned int by_ext(const char *ext, int h = 0)
+{
+    return !ext[h] ? 5381 : (by_ext(ext, h + 1) * 33) ^ ext[h];
+}
+
+
+void apply_performance_hacks(HINSTANCE hmodule, const char *model, const char *ext)
+{
+    log_info("hooks::wmisc", "Enabling performance patches for {}-{}", model, ext);
+    switch (by_model(model))
+    {
+    case by_model("LDJ"):
+        thumbnail::run(hmodule);
+        break;
+    default:
+        break;
+    }
+
+}
+
+
+}