sys: Implement more functionality into splash screen (#223)

* build: Add libcurl

* build: Stop the whole static linking on Windows mess. There's no use anymore

* sys: Added update detector and moved some startup tasks to splash screen

* sys: Updated ImHex icon

* fix: Settings button on welcome page once again works

* build: Fix build on Linux

* sys: Fixed splash window not searching all paths for resources

plugins/libimhex/source/helpers/net.cpp

@@ -0,0 +1,92 @@
+#include <hex/helpers/net.hpp>
+
+#include <hex/helpers/utils.hpp>
+
+#include <filesystem>
+
+namespace hex {
+
+    Net::Net() {
+        curl_global_init(CURL_GLOBAL_DEFAULT);
+        this->m_ctx = curl_easy_init();
+    }
+
+    Net::~Net() {
+        curl_easy_cleanup(this->m_ctx);
+        curl_global_cleanup();
+    }
+
+    static size_t writeToString(void *contents, size_t size, size_t nmemb, void *userp){
+        static_cast<std::string*>(userp)->append((char*)contents, size * nmemb);
+        return size * nmemb;
+    }
+
+    static void setCommonSettings(CURL *ctx, std::string &response, std::string_view path, const std::map<std::string, std::string> &extraHeaders, const std::string &body) {
+        struct curl_slist *headers = nullptr;
+        headers = curl_slist_append(headers, "Cache-Control: no-cache");
+
+        if (!extraHeaders.empty())
+            for (const auto &[key, value] : extraHeaders) {
+                std::string entry = key;
+                entry += ": ";
+                entry += value;
+
+                headers = curl_slist_append(headers, entry.c_str());
+            }
+
+        if (!body.empty())
+            curl_easy_setopt(ctx, CURLOPT_POSTFIELDS, body.c_str());
+
+        curl_easy_setopt(ctx, CURLOPT_HTTPHEADER, headers);
+        curl_easy_setopt(ctx, CURLOPT_USERAGENT, "ImHex/1.0");
+        curl_easy_setopt(ctx, CURLOPT_URL, path.data());
+        curl_easy_setopt(ctx, CURLOPT_FOLLOWLOCATION, 1L);
+        curl_easy_setopt(ctx, CURLOPT_DEFAULT_PROTOCOL, "https");
+        curl_easy_setopt(ctx, CURLOPT_WRITEFUNCTION, writeToString);
+        curl_easy_setopt(ctx, CURLOPT_SSL_VERIFYPEER, 1L);
+        curl_easy_setopt(ctx, CURLOPT_SSL_VERIFYHOST, 1L);
+        for (const auto &resourceDir : hex::getPath(hex::ImHexPath::Resources)) {
+            if (std::filesystem::exists(resourceDir + "/cacert.pem"))
+                curl_easy_setopt(ctx, CURLOPT_CAPATH, resourceDir.c_str());
+        }
+        curl_easy_setopt(ctx, CURLOPT_WRITEDATA, &response);
+        curl_easy_setopt(ctx, CURLOPT_TIMEOUT_MS, 2000L);
+        curl_easy_setopt(ctx, CURLOPT_CONNECTTIMEOUT_MS, 2000L);
+        curl_easy_setopt(ctx, CURLOPT_NOPROGRESS, 1L);
+    }
+
+    Response<std::string> Net::getString(std::string_view url) {
+        std::string response;
+
+        curl_easy_setopt(this->m_ctx, CURLOPT_CUSTOMREQUEST, "GET");
+        setCommonSettings(this->m_ctx, response, url, {}, "");
+
+        CURLcode result = curl_easy_perform(this->m_ctx);
+
+        u32 responseCode = 0;
+        curl_easy_getinfo(this->m_ctx, CURLINFO_RESPONSE_CODE, &responseCode);
+
+        if (result != CURLE_OK)
+            return Response<std::string>{ responseCode, "" };
+        else
+            return Response<std::string>{ responseCode, response };
+    }
+
+    Response<nlohmann::json> Net::getJson(std::string_view url) {
+        std::string response;
+
+        curl_easy_setopt(this->m_ctx, CURLOPT_CUSTOMREQUEST, "GET");
+        setCommonSettings(this->m_ctx, response, url, {}, "");
+
+        CURLcode result = curl_easy_perform(this->m_ctx);
+
+        u32 responseCode = 0;
+        curl_easy_getinfo(this->m_ctx, CURLINFO_RESPONSE_CODE, &responseCode);
+
+        if (result != CURLE_OK)
+            return Response<nlohmann::json>{ responseCode, { } };
+        else
+            return Response<nlohmann::json>{ responseCode, nlohmann::json::parse(response) };
+    }
+
+}