Merge functionality of misc_os_dependent into time_helper.h

Actions:
1. Remove unused functions from misc_os_dependent.h
2. Move three remaining functions, get_gmt_time, get_ns_count, and get_tick_count into time_helper.h
3. Remove unused functions from time_helper.h
4. Refactor get_ns_count and get_internet_time_str and get_time_interval_string
5. Remove/add includes as needed

Relevant commits on the old PR:
a9fbe52b02ffab451e90c977459fea4642731cd1
9a59b131c4ed1be8afe238fff3780fe203c65a46
7fa9e2817df9b9ef3f0290f7f86357939829e588

3 files changed, 1 insertions, 46 deletions

diff --git a/contrib/epee/src/CMakeLists.txt b/contrib/epee/src/CMakeLists.txt
index 13d8154f3..808b9f09e 100644
--- a/contrib/epee/src/CMakeLists.txt
+++ b/contrib/epee/src/CMakeLists.txt
@@ -35,7 +35,6 @@ monero_add_library(epee byte_slice.cpp byte_stream.cpp hex.cpp abstract_http_cli
     wipeable_string.cpp levin_base.cpp memwipe.c connection_basic.cpp network_throttle.cpp network_throttle-detail.cpp mlocker.cpp buffer.cpp net_ssl.cpp
     int-util.cpp portable_storage.cpp
     misc_language.cpp
-    misc_os_dependent.cpp
     file_io_utils.cpp
     net_parse_helpers.cpp
     http_base.cpp
diff --git a/contrib/epee/src/misc_os_dependent.cpp b/contrib/epee/src/misc_os_dependent.cpp
deleted file mode 100644
index cd4967131..000000000
--- a/contrib/epee/src/misc_os_dependent.cpp
+++ /dev/null
@@ -1,44 +0,0 @@
-// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
-// All rights reserved.
-// 
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above copyright
-// notice, this list of conditions and the following disclaimer in the
-// documentation and/or other materials provided with the distribution.
-// * Neither the name of the Andrey N. Sabelnikov nor the
-// names of its contributors may be used to endorse or promote products
-// derived from this software without specific prior written permission.
-// 
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER  BE LIABLE FOR ANY
-// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-// 
-
-#include "misc_os_dependent.h"
-#include <boost/lexical_cast.hpp>
-
-namespace epee
-{
-namespace misc_utils
-{
-    // TODO: (vtnerd) This function is weird since boost::this_thread::get_id() exists but returns a different value.    
-	std::string get_thread_string_id()
-	{
-#if defined(_WIN32)
-		return boost::lexical_cast<std::string>(GetCurrentThreadId());
-#elif defined(__GNUC__)  
-		return boost::lexical_cast<std::string>(pthread_self());
-#endif
-	}
-}
-}
diff --git a/contrib/epee/src/mlog.cpp b/contrib/epee/src/mlog.cpp
index bcde215be..092d41777 100644
--- a/contrib/epee/src/mlog.cpp
+++ b/contrib/epee/src/mlog.cpp
@@ -40,7 +40,7 @@
 #include <boost/filesystem.hpp>
 #include <boost/algorithm/string.hpp>
 #include "string_tools.h"
-#include "misc_os_dependent.h"
+#include "time_helper.h"
 #include "misc_log_ex.h"
 
 #undef MONERO_DEFAULT_LOG_CATEGORY