READ_ALL rework (#600)

* Deprecate READ_ALL marker, replace it with a new method 'decodeSequentially'
* Document working with indices in CompositeDecoder
* Rewrite hand-rolled serializers on 'decodeSequentially'
diff --git a/gradle.properties b/gradle.properties
index fac53f0..a9881b5 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,7 +5,7 @@
 group=org.jetbrains.kotlinx
 version=0.14.0
 
-kotlin.version=1.3.60
+kotlin.version=1.3.70-dev-2815
 
 # This version take precedence if 'bootstrap' property passed to project
 kotlin.version.snapshot=1.3-SNAPSHOT
@@ -23,5 +23,5 @@
 org.gradle.parallel=true
 org.gradle.caching=true
 
-org.jetbrains.kotlin.native.jvmArgs=-XX:TieredStopAtLevel=1
-#org.jetbrains.kotlin.native.jvmArgs=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5007
+#kotlin.native.jvmArgs=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5007
+#kotlin.native.disableCompilerDaemon=true