fixed some compiler warnings

added equality checks to sensor-data classes
more robust sensor reader [fixed some issues]
added support for gps
added support for compass
added sensor-data-writer
added test-cases
minor changes

sensors/offline/Splitter.h

@@ -0,0 +1,53 @@
+#ifndef DATA_SPLITTER_H
+#define DATA_SPLITTER_H
+
+#include <string>
+#include <vector>
+
+/**
+ * split an input-file into various tokens
+ */
+class Splitter {
+
+	std::string str;
+	char sep = ';';
+	std::vector<std::string> split;
+
+public:
+
+	/** ctor */
+	Splitter(const std::string& str, const char sep = ';') : str(str), sep(sep) {
+		build();
+	}
+
+	bool has(const int idx) const {return split.size() > idx;}
+
+	const std::string& get(const int idx) const {return split.at(idx);}
+
+	const float getFloat(const int idx) const {return std::stof(get(idx));}
+
+	size_t size() const {return split.size();}
+
+private:
+
+	void build() {
+
+		std::string cur;
+
+		for (char c : str) {
+			if (c == sep) {
+				split.push_back(cur);
+				cur = "";
+			} else {
+				cur += c;
+			}
+		}
+
+		split.push_back(cur);
+
+	}
+
+};
+
+
+#endif // DATA_SPLITTER_H