Refactor jtx::Env:

These changes eliminate the Env's OpenLedger member and make
transactions go through the Application associated with each
instance of the Env, making the unit tests follow a code path
closer to the production code path.

* Add Env::open() for open ledger
* Add Env::now()
* Rename to Env::current()

* Inject ManualTimeKeeper in Env Application
* Make Config mutable
* Move setupConfigForUnitTests
* Launch Env Application thread
* Use Application ledgers in Env
* Adjust Application clock on ledger close
* Adjust close time for close resolution
* Scrub obsolete clock types
* Enable features via Env ctor
* Make Env::master Account object global

* Cache SSL context (performance)
* Cache master wallet keys in Ledger ctor (performance)

Builds/VisualStudio2015/RippleD.vcxproj

@@ -3628,6 +3628,10 @@
     </ClCompile>
     <ClInclude Include="..\..\src\ripple\shamap\TreeNodeCache.h">
     </ClInclude>
+    <ClCompile Include="..\..\src\ripple\test\impl\ManualTimeKeeper.cpp">
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='debug|x64'">True</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='release|x64'">True</ExcludedFromBuild>
+    </ClCompile>
     <ClInclude Include="..\..\src\ripple\test\jtx.h">
     </ClInclude>
     <ClInclude Include="..\..\src\ripple\test\jtx\Account.h">
@@ -3794,6 +3798,8 @@
     </ClInclude>
     <ClInclude Include="..\..\src\ripple\test\jtx\utility.h">
     </ClInclude>
+    <ClInclude Include="..\..\src\ripple\test\ManualTimeKeeper.h">
+    </ClInclude>
     <ClCompile Include="..\..\src\ripple\test\mao\impl\Net.cpp">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='debug|x64'">True</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='release|x64'">True</ExcludedFromBuild>

Builds/VisualStudio2015/RippleD.vcxproj.filters

@@ -412,6 +412,9 @@
     <Filter Include="ripple\test">
       <UniqueIdentifier>{B25F5854-84AE-1CBD-DFFC-6515DD055652}</UniqueIdentifier>
     </Filter>
+    <Filter Include="ripple\test\impl">
+      <UniqueIdentifier>{CF7F0C3F-3D61-7764-BA8B-5FF38018425C}</UniqueIdentifier>
+    </Filter>
     <Filter Include="ripple\test\jtx">
       <UniqueIdentifier>{A21A3B94-5C44-3746-4F10-6FF8FF990CE3}</UniqueIdentifier>
     </Filter>
@@ -4284,6 +4287,9 @@
     <ClInclude Include="..\..\src\ripple\shamap\TreeNodeCache.h">
       <Filter>ripple\shamap</Filter>
     </ClInclude>
+    <ClCompile Include="..\..\src\ripple\test\impl\ManualTimeKeeper.cpp">
+      <Filter>ripple\test\impl</Filter>
+    </ClCompile>
     <ClInclude Include="..\..\src\ripple\test\jtx.h">
       <Filter>ripple\test</Filter>
     </ClInclude>
@@ -4458,6 +4464,9 @@
     <ClInclude Include="..\..\src\ripple\test\jtx\utility.h">
       <Filter>ripple\test\jtx</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\ripple\test\ManualTimeKeeper.h">
+      <Filter>ripple\test</Filter>
+    </ClInclude>
     <ClCompile Include="..\..\src\ripple\test\mao\impl\Net.cpp">
       <Filter>ripple\test\mao\impl</Filter>
     </ClCompile>

Builds/VisualStudio2015/ripple.sln

@@ -5,8 +5,6 @@ VisualStudioVersion = 14.0.23107.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "RippleD", "RippleD.vcxproj", "{26B7D9AC-1A80-8EF8-6703-D061F1BECB75}"
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{CF990ABA-EAE4-47AB-BF5E-0BCBB95CE325}"
-EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		debug.classic|x64 = debug.classic|x64