add new build system

.gitmodules

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+[submodule "tools"]
+	path = tools
+	url = https://github.com/GenZmeY/KF2-BuildTools

build.cfg

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+# Build parameters 
+
+# If True - compresses the mutator when compiling
+# Scripts will be stored in binary form
+# (reduces the size of the output file)
+StripSource="True"
+
+# Mutators to be compiled
+# Specify them with a space as a separator,
+# Mutators will be compiled in the specified order 
+PackageBuildOrder="ServerExt ServerExtMut"
+
+# Mutators that will be uploaded to the workshop
+# Specify them with a space as a separator,
+# The order doesn't matter 
+PackageUpload="ServerExt ServerExtMut"

test.cfg

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+# Test parameters 
+
+# Map:
+Map="KF-Nuked"
+
+# Game:
+# Survival:       KFGameContent.KFGameInfo_Survival
+# WeeklyOutbreak: KFGameContent.KFGameInfo_WeeklySurvival
+# Endless:        KFGameContent.KFGameInfo_Endless
+# Objective:      KFGameContent.KFGameInfo_Objective
+# Versus:         KFGameContent.KFGameInfo_VersusSurvival
+Game="KFGameContent.KFGameInfo_Survival"
+
+# Difficulty:
+# Normal:         0
+# Hard:           1
+# Suicide:        2
+# Hell:           3
+Difficulty="0"
+
+# GameLength:
+# 4  waves:       0
+# 7  waves:       1
+# 10 waves:       2
+GameLength="0"
+
+# Mutators
+Mutators="ServerExtMut.ServerExtMut"
+
+# Additional parameters
+Args=""