Remove kotlinx-datetime dependency (#30)

This is supposed to make consumption of the library more simple.

build.gradle

@@ -25,7 +25,6 @@ kotlin {
         commonMain {
             dependencies {
                 implementation kotlin('stdlib-common')
-                implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.1.1")
             }
         }
 

src/commonMain/kotlin/com/github/fwilhe/inzell/Inzell.kt

@@ -1,14 +1,11 @@
 package com.github.fwilhe.inzell
 
-import kotlinx.datetime.Instant
-
 typealias columnFunction = (Int) -> Any
 
 class Column(val title: String, private val function: columnFunction) {
     fun eval(i: Int): Any = function.invoke(i)
     fun evalInt(i: Int): Int = function.invoke(i) as Int
     fun evalDouble(i: Int): Double = function.invoke(i) as Double
-    fun evalDate(i: Int): Instant = function.invoke(i) as Instant
     fun evalString(i: Int): String = function.invoke(i) as String
 }
 

src/commonTest/kotlin/SheetsTest.kt

@@ -1,6 +1,5 @@
 package com.github.fwilhe.inzell
 
-import kotlinx.datetime.*
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.time.Duration
@@ -14,41 +13,6 @@ class SheetsTest {
         assertEquals(expected, sheet)
     }
 
-    @ExperimentalTime
-    @Test
-    fun dateCalculations() {
-        fun f(x: Int): LocalDateTime {
-            return when (x) {
-                1 -> LocalDateTime(2016, 2, 15, 16, 57, 0, 0)
-                2 -> LocalDateTime(2017, 4, 15, 16, 7, 0, 0)
-                3 -> LocalDateTime(2018, 2, 20, 16, 5, 0, 0)
-                4 -> LocalDateTime(2019, 2, 15, 1, 57, 0, 0)
-                5 -> LocalDateTime(2020, 2, 15, 16, 5, 0, 0)
-                6 -> LocalDateTime(2021, 2, 15, 16, 22, 0, 0)
-                else -> LocalDateTime(0, 1, 1, 0, 0, 0, 0)
-            }
-        }
-
-        fun g(x: Int): Instant {
-            val now = Clock.System.now()
-            val instantInThePast: Instant = Instant.parse("2020-01-01T00:00:00Z")
-            val durationSinceThen: Duration = now - instantInThePast
-            return f(x).toInstant(TimeZone.UTC) + durationSinceThen
-        }
-
-        fun h(x: Int): Duration {
-            return (f(x).toInstant(TimeZone.UTC) - g(x)).absoluteValue
-        }
-
-        val sheet = spreadsheet {
-            add(Column("Date", ::f))
-            add(Column("Future with added duration", ::g))
-            add(Column("Duration between", ::h))
-        }
-
-        MarkdownPrinter(sheet).printToStandardOut()
-    }
-
     @Test
     fun printTables() {
         val numberOfCpus = Column("Number of CPUs") { x -> x * x }