Big refactor of mining pool support, optimization of existing icons

src/lib/mining_pool/braiins/brains_pool.cpp

@@ -0,0 +1,32 @@
+#include "brains_pool.hpp"
+
+void BraiinsPool::prepareRequest(HTTPClient& http) const {
+    http.addHeader("Pool-Auth-Token", poolUser.c_str());
+}
+
+std::string BraiinsPool::getApiUrl() const {
+    return "https://pool.braiins.com/accounts/profile/json/btc/";
+}
+
+PoolStats BraiinsPool::parseResponse(const JsonDocument &doc) const
+{
+    std::string unit = doc["btc"]["hash_rate_unit"].as<std::string>();
+
+    static const std::unordered_map<std::string, int> multipliers = {
+        {"Zh/s", 21}, {"Eh/s", 18}, {"Ph/s", 15}, {"Th/s", 12}, {"Gh/s", 9}, {"Mh/s", 6}, {"Kh/s", 3}};
+
+    int multiplier = multipliers.at(unit);
+    float hashValue = doc["btc"]["hash_rate_5m"].as<float>();
+
+    return PoolStats{
+        .hashrate = std::to_string(static_cast<int>(std::round(hashValue))) + std::string(multiplier, '0'),
+        .dailyEarnings = static_cast<int64_t>(doc["btc"]["today_reward"].as<float>() * 100000000)};
+}
+
+LogoData BraiinsPool::getLogo() const {
+    return LogoData{
+        .data = epd_icons_allArray[5],
+        .width = 122,
+        .height = 250
+    };
+}