Fixed installer detection to evaluate IsccPath safely when the path contains spaces by changing the existence check to Exists('$(IsccPath)').

Fixed ISCC path normalization by trimming surrounding quotes from ZOITECHAT_ISCC_PATH and storing discovered default paths unquoted (so they can be checked reliably with Exists(...)).
Fixed installer invocation by quoting $(IsccPath) at execution time in the pre-build command, which supports paths like C:\Program Files (x86)\Inno Setup 6\ISCC.exe

win32/installer/installer.vcxproj

@@ -39,7 +39,7 @@
 SET SOLUTIONDIR=$(SolutionDir)..\
 if not exist "$(ZoiteChatBin)" mkdir "$(ZoiteChatBin)"
 powershell -File "$(SolutionDir)..\win32\version-template.ps1" "$(SolutionDir)..\win32\installer\zoitechat.iss.tt" "$(ZoiteChatBin)zoitechat.iss"
-$(IsccPath) /dPROJECTDIR="$(ProjectDir)" /dAPPARCH="$(Platform)" "$(ZoiteChatBin)zoitechat.iss"
+"$(IsccPath)" /dPROJECTDIR="$(ProjectDir)" /dAPPARCH="$(Platform)" "$(ZoiteChatBin)zoitechat.iss"
       ]]>
       </Command>
     </PreBuildEvent>

win32/zoitechat.props

@@ -33,7 +33,7 @@
 		<Python3Enabled Condition="'$(Python3Enabled)'==''">false</Python3Enabled>
 		<PerlEnabled Condition="Exists('$(PerlPath)\\bin\\perl.exe') and Exists('$(PerlPath)\\bin\\$(PerlLib).dll') and Exists('$(GendefPath)\\gendef.exe')">true</PerlEnabled>
 		<PerlEnabled Condition="'$(PerlEnabled)'==''">false</PerlEnabled>
-		<InstallerEnabled Condition="Exists($(IsccPath))">true</InstallerEnabled>
+		<InstallerEnabled Condition="Exists('$(IsccPath)')">true</InstallerEnabled>
 		<InstallerEnabled Condition="'$(InstallerEnabled)'==''">false</InstallerEnabled>
 		<LuaInclude>$(DepsRoot)\include\luajit-2.1;$(DepsRoot)\include\lua;$(DepsRoot)\include\lua5.1;$(DepsRoot)\include\lua54;$(DepsRoot)\include\lua5.4;$(DepsRoot)\include\lua-5.4;$(SolutionDir)..\plugins\lua\luajit\src;$(SolutionDir)..\plugins\lua\luajit\src\jit</LuaInclude>
 		<LuaOutput>hclua</LuaOutput>